All previously answered questions (in order of times viewed)
- What's going to happen on December 21st 2012? (viewed 311177 times)
- What color is each planet? (viewed 279469 times)
- Is the Moon moving away from the Earth? When was this discovered? (viewed 249209 times)
- How far is each planet from Earth? (viewed 213244 times)
- How do I build a model rocket? (viewed 210836 times)
- What is the life cycle of a star? (viewed 183447 times)
- How many stars are there in our Galaxy (Milky Way)? (viewed 173933 times)
- How do you measure the distance between Earth and the Sun? (viewed 170498 times)
- What is the largest star? (viewed 167504 times)
- What is a white hole? (viewed 154139 times)
- What color is Venus? (viewed 142806 times)
- Why do the planets orbit the sun? (viewed 128400 times)
- Which planets have rings? (viewed 123620 times)
- At what speed does the earth move around the sun? (viewed 122631 times)
- What are the names of the earth, moon, sun, and solar system? (viewed 108848 times)
- Is the distance from the Earth to the Sun changing? (viewed 106404 times)
- What makes the Earth rotate? (viewed 104590 times)
- Why do stars twinkle? (viewed 100341 times)
- What do astronauts eat in space? Can they grow food? (viewed 95200 times)
- Is Pluto a planet? (viewed 95187 times)
- What is the universe expanding into? (viewed 93361 times)
- Does the Moon rotate? Are there other moons that always keep one face toward their planet? (viewed 91457 times)
- How long does it take for the Sun's light to reach us? (viewed 85509 times)
- Why do planets rotate? (viewed 84140 times)
- Where did the name 'Earth' come from? (viewed 82051 times)
- Will the sun go supernova in six years and destroy Earth (as seen on Yahoo)? (viewed 81991 times)
- What are shooting stars? (viewed 79910 times)
- What is the largest galaxy? (viewed 77018 times)
- Who named the planets and who decides what to name them? (viewed 76813 times)
- Why are there both high and low tides? (viewed 75370 times)
- How many known galaxies are there? (viewed 74072 times)
- How critical is the Earth-Sun distance in maintaining our average temperatures on Earth? (viewed 64982 times)
- How do we know the age of the Universe and the Earth? (viewed 63991 times)
- What was there before the Big Bang and what is there outside of our universe? (viewed 63931 times)
- How does the location of sunrise and sunset change throughout the year? (viewed 63082 times)
- Is the Sun expanding? Will it ever explode? (viewed 61094 times)
- When is the next comet due to arrive? (viewed 59909 times)
- Can you hear sounds in space? (viewed 58778 times)
- How many Earths fit into the Sun? (viewed 58087 times)
- What would happen if an impact caused Earth to stop rotating? (viewed 57900 times)
- Will the magnetic field of the Earth reverse its direction in the future? Will this cause problems? (viewed 57397 times)
- Are there telescopes that can see the flag and lunar rover on the Moon? (viewed 56964 times)
- Have astronomers discovered Earth's second moon? (viewed 55645 times)
- What is the hottest time of day? (viewed 55231 times)
- Did astronauts really go to the Moon, or is it a hoax? (viewed 55164 times)
- When will Halley's Comet return? (viewed 54650 times)
- What kind of rock is the moon made of? (viewed 54291 times)
- What is apparent magnitude? (viewed 53048 times)
- What would happen if we did not have a Moon? (viewed 53002 times)
- What will happen to life on Earth when the Sun becomes a red giant? (viewed 52884 times)
- How does the position of Moonrise and Moonset change? (viewed 52779 times)
- How do stars move in the Galaxy? (viewed 51564 times)
- What is the observational difference between a star and a planet? (viewed 51432 times)
- What is at the end of the Universe? (viewed 50846 times)
- If Mars is only about 35-60 million miles away at close approach, why does it take 6-8 months to get there? (viewed 50384 times)
- Can I buy a star? (viewed 49720 times)
- Does the Sun orbit the Earth as well as the Earth orbiting the Sun? (viewed 49148 times)
- Who has landed on the moon? (viewed 48958 times)
- Is the universe expanding faster than the speed of light? (viewed 48569 times)
- What is the physical difference between a star and a planet? (viewed 47078 times)
- How long does a solar eclipse last? (viewed 47063 times)
- Why is a day divided into 24 hours? (viewed 47011 times)
- Can we feel the Earth spin? (viewed 46885 times)
- How do astronauts take baths and use restrooms in space? (viewed 45164 times)
- Does the Sun have a scientific name? (viewed 45081 times)
- What happens when galaxies collide? (viewed 44698 times)
- What direction do planets rotate? (viewed 44621 times)
- Why aren't there any green stars? (viewed 44515 times)
- Does the Sun move around the Milky Way? (viewed 44426 times)
- How do you calculate the lifetime of the Sun? (viewed 44227 times)
- Does the Sun rotate? (viewed 44079 times)
- What is that ring (or rainbow) around the moon? (viewed 43659 times)
- Why are the Moon and Sun sometimes orange or red? (viewed 43308 times)
- How can I find the star I have "bought"? (viewed 43168 times)
- Is there a proof that Earth moves? (viewed 42868 times)
- How do rockets work? (viewed 42493 times)
- Why do planets have elliptical orbits? (viewed 42203 times)
- What causes seasons? (viewed 42131 times)
- Why are stars and planets round? (viewed 42043 times)
- Can artificial gravity be created in space? (viewed 41874 times)
- What are the "dog days of summer"? (viewed 41420 times)
- What is a singularity? (viewed 41259 times)
- Where does the name "Milky Way" come from? (viewed 41101 times)
- How much money do astronomers make? (viewed 41022 times)
- How can we see the Milky Way if we are inside it? (viewed 40524 times)
- How many constellations are there? (viewed 40449 times)
- What are the advantages and disadvantages of using a telescope in space? (viewed 40319 times)
- Do stars move in the sky? (viewed 40289 times)
- Since Earth is spinning, why do we land in the same place when we jump or fall? (viewed 40196 times)
- What elements make up the Sun? (viewed 40102 times)
- What would happen if an asteroid 10 kilometers across hit the Earth? (viewed 39972 times)
- What is a nova? (viewed 39747 times)
- How are black holes made? Could one be made close to us? (viewed 39716 times)
- How does the Sun compare to other stars? (viewed 39529 times)
- What is the mass of the Universe? (viewed 39487 times)
- How are light and heavy elements formed? (viewed 39390 times)
- What is the largest structure in the universe? (viewed 38947 times)
- Why doesn't the earliest sunset occur on the shortest day of the year? (viewed 38635 times)
- Where did the Universe come from? (viewed 38462 times)
- Why do airplanes take longer to fly West than East? (viewed 38137 times)
- What are RA and DEC? (viewed 37695 times)
- When can I see the Moon through the hole in the Pantheon? (viewed 37650 times)
- Is time travel possible? (viewed 37556 times)
- Why doesn't the length of each day change much around the solstices? (viewed 37437 times)
- Why does the Earth have only one moon? (viewed 37388 times)
- Who first measured the speed of light? (viewed 37291 times)
- What is the size of the Solar System? (viewed 37226 times)
- What's the best college for astronomy? (viewed 37118 times)
- Which planet is most similar to Earth? (viewed 37104 times)
- Does your weight change between the poles and the equator? (viewed 36549 times)
- Is it possible to measure the temperature of the Sun? (viewed 36513 times)
- What would happen if the gravity on Earth was suddenly turned off? (viewed 36442 times)
- How much money is spent on space exploration? (viewed 36357 times)
- If the Earth's rotation period is less than 24 hours, why don't our clocks fall out of sync with the Sun? (viewed 36196 times)
- What would you see from inside a black hole? (viewed 36124 times)
- Why is the Universe flat and not spherical? (viewed 35892 times)
- Will the Sun become a black hole one day? (viewed 35292 times)
- What happens to a substance if its speed is more than the speed of light? (viewed 35230 times)
- What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (viewed 35204 times)
- Traveling at light speed, how long would it take to get to the nearest galaxy? (viewed 35161 times)
- How many stars are born and die each day? (viewed 35045 times)
- What is the density of a black hole? (viewed 34956 times)
- How do astronomers use math in their jobs? (viewed 34903 times)
- Where are stars born? (viewed 34885 times)
- Could there be life in the galaxies nearest to the Milky Way? (viewed 34866 times)
- What are some astronomy science fair projects? (viewed 34720 times)
- How often does the Sun pass through a spiral arm in the Milky Way? (viewed 34522 times)
- Do most astronomers believe in God based on the available scientific evidence? (viewed 34520 times)
- What would happen if a supermassive black hole came close to the Earth? (viewed 34270 times)
- How do we know the mass of the Earth and the Moon? (viewed 33907 times)
- Do black holes die? If so how? (viewed 33769 times)
- How did the stars get named? (viewed 33754 times)
- Does the Moon rotate? (viewed 33680 times)
- If the universe is infinite does that mean there is an infinite number of "me"s? (viewed 33564 times)
- Why isn't the summer solstice the hottest day of the year? (viewed 33510 times)
- How are galaxies formed? (viewed 33375 times)
- When was the last time all 9 planets were aligned? (viewed 33316 times)
- What is the shape of the universe? (viewed 33164 times)
- How can I find the distance to the Sun on any given day? (viewed 33122 times)
- What kinds of jobs do astronomers do? (viewed 33116 times)
- How does the parachute in a model rocket work? (viewed 32963 times)
- What makes the wind? (viewed 32726 times)
- When the Sun converts mass to energy, do the orbits of the planets change? (viewed 32666 times)
- Are names given to black holes? (viewed 32365 times)
- Are aliens or UFOs real? (viewed 31903 times)
- What are constellations used for? (viewed 31781 times)
- Are there any asteroids on a collision course with Earth? (viewed 31676 times)
- Why do planets not twinkle? (viewed 31590 times)
- Why do different stars appear with seasons? (viewed 31582 times)
- What would happen to us if the sun went out for an hour? (viewed 31510 times)
- Was the Sun made in a supernova? (viewed 31483 times)
- Where does the name "Moon" come from? (viewed 31446 times)
- What are black holes made of? (viewed 31414 times)
- Does gravity vary across the surface of the Earth? (viewed 31350 times)
- What are Altitude and Azimuth? (viewed 31228 times)
- Considering the motion of the Earth, the solar system, and the galaxy, how fast am I moving while lying in bed asleep? (viewed 31211 times)
- Why is the Moon so bright? (viewed 31156 times)
- What is the biggest crater recorded on Earth? (viewed 31109 times)
- How can the Universe expand faster than the speed of light during inflation? (viewed 31049 times)
- How do astronomers measure the brightness of stars? (viewed 31029 times)
- How long would it take the Earth to fall into the Sun? (viewed 31026 times)
- What can I use for fuel in my homemade rocket? (viewed 30988 times)
- Why is it difficult to understand the expansion of the universe? (viewed 30889 times)
- Who discovered each planet? (viewed 30679 times)
- What do astronauts do all day in the International Space Station? (viewed 30619 times)
- Where, in relation to the entire universe, is the Milky Way located? (viewed 30581 times)
- How did asteroids form and what is the difference between an asteroid and a comet? (viewed 30512 times)
- If light has no mass, then what draws it into a black hole? (viewed 30511 times)
- How can I measure the distance of a star? (viewed 30500 times)
- How does the Moon stay "suspended" in the air? (viewed 30459 times)
- Why hasn't NASA gone back to the moon? (viewed 30392 times)
- How do astronauts use math in their jobs? (viewed 30040 times)
- How do we measure the size of the Moon and of the Sun? (viewed 30026 times)
- How do you calculate the azimuth and altitude of an object? (viewed 29847 times)
- What's the difference between astronomy and astrology? (viewed 29522 times)
- How do you measure a planet's mass? (viewed 29410 times)
- What kind of schooling is necessary to become an astronomer? (viewed 29397 times)
- What is time dilation? (viewed 29298 times)
- How big is the universe? (viewed 29273 times)
- Where is the nearest black hole? (viewed 29247 times)
- Why does the Moon look big on the horizon? (viewed 29228 times)
- Can you fire a gun on the Moon? (viewed 29092 times)
- Can you see satellites? (viewed 29021 times)
- What is the size of a black hole? (viewed 28863 times)
- What happens when two black holes get too close? (viewed 28807 times)
- Is the speed of light constant? (viewed 28792 times)
- What do I need to do to become an astronomer? (viewed 28660 times)
- Do dead stars still shine? (viewed 28584 times)
- What other careers involve Astronomy besides Astronomer? (viewed 28446 times)
- What would happen if Earth had more than one moon? (viewed 28369 times)
- What are some of the effects of solar flares on Earth? (viewed 28366 times)
- How is astronomy impacted by trigonometry? (viewed 28360 times)
- Why does the Earth tilt back and forward once a year? (viewed 28260 times)
- Where is the supernova remnant that led to our solar system? (viewed 28020 times)
- How do you measure the mass of a star? (viewed 27877 times)
- Can I buy land on the Moon? (viewed 27787 times)
- How fast is the Universe expanding? (viewed 27777 times)
- Why can't you see stars during the day? (viewed 27754 times)
- Why does Barnard 68 appear dark? (viewed 27611 times)
- Why does the Earth only see one side of the Moon? (viewed 27541 times)
- What makes up most of the Universe? (viewed 27515 times)
- What is the origin of spiral structure in galaxies? (viewed 27420 times)
- How do rockets move in space? (viewed 27251 times)
- How do gravitons escape black holes to tell the universe about their gravity? (viewed 27201 times)
- Does Mt. Everest cast a shadow on the moon? (viewed 27134 times)
- Would your weight change as you go underground? (viewed 27032 times)
- Where did all the water in the universe come from? (viewed 26949 times)
- Why do pictures of distant galaxies have higher resolution than those of nearby planets? (viewed 26877 times)
- Why do all the planets orbit in the same plane? (viewed 26865 times)
- What is the most distant known galaxy? (viewed 26757 times)
- Can I calculate the size of the Universe by converting light years to kilometres? (viewed 26732 times)
- Will we get sucked into the black hole at the center of the Milky Way? (viewed 26668 times)
- Can we look back far enough in time to see the Big Bang? (viewed 26661 times)
- How are elements heavier than iron formed? (viewed 26583 times)
- Why is the moon in a different place every night? (viewed 26442 times)
- How can two moons of Saturn share the same orbit? (viewed 26432 times)
- What would happen if the Moon fell out of its orbit around Earth? (viewed 26402 times)
- Why do the size and brightness of the full moon change? (viewed 26397 times)
- Where did the matter in the universe come from? (viewed 26395 times)
- Why do stars change colour when they twinkle? (viewed 26353 times)
- How do galaxies collide in an expanding universe? (viewed 26325 times)
- Can any galaxies be seen with the naked eye? (viewed 26092 times)
- What is a star's "spectrum"? (viewed 25959 times)
- Why do we see stars? (viewed 25930 times)
- How many meteorites hit Earth each year? (viewed 25919 times)
- What are the different kinds of astronomers? (viewed 25871 times)
- What is a graviton? (viewed 25826 times)
- What was that really big falling star that I saw? (viewed 25751 times)
- How can I calculate the position or path of the Sun for a given time and location? (viewed 25727 times)
- Why doesn't dark matter fall into a black hole? (viewed 25621 times)
- What can we learn from the color of a star? (viewed 25539 times)
- How are black holes discovered? (viewed 25519 times)
- Is the Great Wall the largest galaxy cluster? (viewed 25434 times)
- Why can't we see Venus at night when it is an inner planet? (viewed 25384 times)
- What would happen to the Earth if an asteroid hit the Moon? (viewed 25353 times)
- What is the difference between a "star" and a "sun"? (viewed 25322 times)
- What's the biggest meteorite? (viewed 25314 times)
- Why is sea water salty, and not lake water? (viewed 25205 times)
- What is the speed of gravity? (viewed 25143 times)
- How can a star burn with no oxygen? (viewed 25091 times)
- How much longer will the Earth last? (viewed 25070 times)
- How does light pollution affect astronomers? (viewed 24950 times)
- Why is looking out the same as looking back in time? (viewed 24913 times)
- Could someone travel the universe in his or her own lifetime? (viewed 24900 times)
- How many stars can I see? (viewed 24844 times)
- Do the Sun's or Earth's magnetic field reverse? (viewed 24843 times)
- Why is twilight short near the equator? (viewed 24702 times)
- Can terrestrial planets have rings? (viewed 24638 times)
- Why does the location of sunrise change? (viewed 24464 times)
- Which constellation does our Sun belong to? (viewed 24404 times)
- How do I tell which planet is which? (viewed 24376 times)
- Why are there stars? (viewed 24376 times)
- What happens to a bullet fired on the moon? (viewed 24308 times)
- How long has there been water on Earth? (viewed 24286 times)
- How can I find my age on another planet? (viewed 24234 times)
- What is the typical size of a visible shooting star? (viewed 24216 times)
- Does quantum entanglement imply faster than light communication? (viewed 24212 times)
- Is the Earth slowly getting larger? (viewed 24104 times)
- What is Earthrise over the Moon? (viewed 24103 times)
- Did life originate on Earth, or did it come from somewhere else? (viewed 24088 times)
- Is the Moon hollow? (viewed 23984 times)
- How does night and day work? (viewed 23956 times)
- Is it possible to count the stars? (viewed 23934 times)
- How can we estimate the number of Earth-like planets in the Galaxy? (viewed 23900 times)
- Is time travel possible using merging black holes? (viewed 23896 times)
- Why have star signs shifted by one constellation? (viewed 23861 times)
- Is there really a 10th planet? (viewed 23856 times)
- Do supermassive black holes cause galaxy rotation? (viewed 23848 times)
- What is the evidence supporting the nebula theory of Solar System formation? (viewed 23795 times)
- What's the difference between astronomy and astrophysics? (viewed 23764 times)
- Is there a "South Star"? (viewed 23739 times)
- How long does the supernova stage of a star last? (viewed 23706 times)
- Why don't astronomers use everyday units to measure distances (what is an AU or a pc)? (viewed 23688 times)
- Has there been an experiment that measured speed faster than the speed of light in vacuum? (viewed 23638 times)
- What is the approximate GPA needed in High School in Math and Science to be an astronomer? (viewed 23625 times)
- Is Andromeda part of the Milky Way? Where can I find them in the sky? (viewed 23625 times)
- Does the Mediterranean sea have tides? (viewed 23617 times)
- Does evolution contradict the second law of thermodynamics? (viewed 23571 times)
- Which hemisphere has the best view of the Milky Way? (viewed 23560 times)
- Does the Coriolis force determine which way my toilet drains? Does it affect black holes? (viewed 23257 times)
- Why does the Sun's apparent path through the sky change throughout the year? (viewed 23251 times)
- How close was the Moon to the Earth when it formed? (viewed 23208 times)
- How can I calculate distances between stars? (viewed 23206 times)
- Are meteorites hot or cold when they hit Earth? (viewed 23194 times)
- Why is our solar system so different from all the others we've found? (viewed 23007 times)
- Can moons have moons? (viewed 23007 times)
- How would the weather on Earth be different if it were a cube? (viewed 22985 times)
- Could the Universe have expanded faster than the speed of light at the Big Bang? (viewed 22931 times)
- Is the Earth at the centre of the Universe? (viewed 22877 times)
- Is it possible to see the full Moon and the Sun simultaneously in high northern latitudes when the Sun doesn't set? (viewed 22846 times)
- When we look back to the Big Bang, why don't we see the universe as a tiny speck of matter? (viewed 22839 times)
- What skills do astronomers need? (viewed 22749 times)
- What is a dimension? (viewed 22709 times)
- Can I communicate faster than light? (viewed 22691 times)
- How long would it take for a mini-black hole to eat the Earth? (viewed 22638 times)
- Can you see the future as you fall into a black hole? (viewed 22601 times)
- How can we distinguish a star's "real" color from the change in color that we observe due to the star's motion? (viewed 22577 times)
- Which American colleges teach astronomy? (viewed 22556 times)
- Why do we not have eclipses every month? (viewed 22495 times)
- What are the closest and/or brightest stars? (viewed 22481 times)
- Are all stars the same? (viewed 22374 times)
- What is the pattern to the distances between each planet and the sun? (viewed 22343 times)
- Why doesn't gravity change the speed of light? (viewed 22272 times)
- If a white dwarf is a "dead" star, why is it so hot? (viewed 22235 times)
- Is there any limitation to what a black hole can "suck" in? (viewed 22230 times)
- How does the brightness of a star depend on its distance from us? (viewed 22163 times)
- Can a person go into a black hole and come out alive? (viewed 22147 times)
- How many moles of stars are in the known universe? (viewed 22147 times)
- Is the Moon seen as a crescent (and not a "boat") all over the world? Is the same phase of the moon visible from the Northern and Southern hemispheres? (viewed 22120 times)
- Are time machines possible? (viewed 22078 times)
- How is the time of sunrise calculated? (viewed 22074 times)
- Can we colonize other planets? (viewed 22070 times)
- What is happening just around the black hole in the center of the Milky Way? (viewed 21874 times)
- What is the difference between the "Doppler" redshift and the "gravitational" or "cosmological" redshift? (viewed 21865 times)
- How do we define distance in an expanding universe? (viewed 21733 times)
- What would happen if you took off your helmet in space? (viewed 21689 times)
- How dangerous are the asteroids? (viewed 21611 times)
- What is the significance of the second focus of elliptical orbits of planets in our Solar System? (viewed 21545 times)
- What are the requirements for being a planet? (viewed 21541 times)
- How is it that we see farther out in space (farther back in time) than in the past? (viewed 21505 times)
- Can a lunar and a solar eclipse happen in the same month? When will this happen next? (viewed 21500 times)
- If the universe is 15 billion years old, how can it be larger than 15 billion light years across? (viewed 21489 times)
- What happens to spacetime inside a black hole? (viewed 21406 times)
- What is the difference between nutation and precession of the Earth? (viewed 21390 times)
- Is there a simple formula to calculate solar eclipse timings from any position on Earth? (viewed 21379 times)
- What companies or businesses can astronomers work for? (viewed 21375 times)
- How do we know that nuclear fusion is still going on in the Sun? (viewed 21360 times)
- Could an astronaut or satellite fall into a black hole that we didn't know about? (viewed 21281 times)
- What's that dark spot on the Sun? (viewed 21269 times)
- How does astronomy benefit humankind? (viewed 21259 times)
- Are Earth and the Moon "twin planets"? (viewed 21244 times)
- Can we find the place where the Big Bang happened? (viewed 21198 times)
- How do I make a scale model of the Solar System? (viewed 21196 times)
- How long could life on Earth survive if the Sun stopped shining? (viewed 21165 times)
- How are galaxy distances inferred from their recessional velocities? (viewed 21138 times)
- What's the difference between dark matter and dark energy? (viewed 21129 times)
- How do we measure distances to other stars? (viewed 21048 times)
- How will the two black holes that are going to collide affect Earth? (viewed 21033 times)
- Why do people draw stars with five points? (viewed 20984 times)
- How are galaxies named? (viewed 20895 times)
- What are the facts about the Star of Bethlehem? (viewed 20892 times)
- Did the speed of light change over the history of the universe? (viewed 20892 times)
- The Moon slows the Earth's rotation, but how fast was it spinning billions of years ago? (viewed 20885 times)
- Don't tachyons travel faster than light? (viewed 20794 times)
- What are the atmospheres of Mars and Pluto like? (viewed 20786 times)
- Are Kuiper Belt Objects asteroids? Are large Kuiper Belt Objects planets? (viewed 20726 times)
- Was I hit by a meteorite? (viewed 20723 times)
- Has anyone made a map of the Milky Way? (viewed 20696 times)
- Will the Moon be invisible in 500 million years? (viewed 20667 times)
- How do we weigh objects in space? (viewed 20663 times)
- If gravity is a "curvature of space" rather than a force, why do a ball and bullet follow different paths? (viewed 20660 times)
- What are quasars made of? (viewed 20654 times)
- Have there been other Big Bangs before? (viewed 20636 times)
- How big a change in the Earth's orbit would be required to destroy all life? (viewed 20613 times)
- What do a galaxy's colors mean? Are they its true colors? (viewed 20530 times)
- Are there eclipses on other planets? (viewed 20434 times)
- Why do constellations look the same after several years even though all the stars are moving? (viewed 20398 times)
- Who came up with the name "black hole"? (viewed 20374 times)
- Will winter and summer constellations change due to abnormal warmth or cold on Earth? (viewed 20352 times)
- Can life exist on the recently discovered extrasolar planets? (viewed 20327 times)
- Why do most moons orbit their planets at the equator? (viewed 20214 times)
- Aren't jobs in astronomy scarce? (viewed 20197 times)
- How much time do astronomers spend looking through telescopes? (viewed 20153 times)
- What is dark matter? (viewed 20085 times)
- How close do you have to come to the Earth to be influenced by its gravity? (viewed 20042 times)
- Where do planetary rings come from, and what are they made of? (viewed 19920 times)
- How do I become both an astronaut and an astronomer? (viewed 19890 times)
- How far does a galaxy extend? (viewed 19754 times)
- What if the Earth rotated twice as fast? (viewed 19743 times)
- Can we see dead stars with the naked eye? (viewed 19737 times)
- How can I tell if the rock I found is a meteorite? (viewed 19602 times)
- What would happen if two stars collided? (viewed 19580 times)
- Why do the explosions of Type Ia supernovae have a more predictable spectrum than those of regular Type II supernovae? (viewed 19516 times)
- Why don't people walk upside-down on the bottom of the Earth? (viewed 19492 times)
- Can superheavy elements (such as Z=116 or 118) be formed in a supernova? Can we observe them? (viewed 19441 times)
- Is the gravitational force exerted by the Earth on the Moon equal to the centripetal force acting on the Moon? (viewed 19430 times)
- How do the astronauts communicate in space if sound cannot travel in a vacuum? (viewed 19424 times)
- How will a change in the speed of light affect the evolution of the Universe? (viewed 19387 times)
- Can one star orbit another? (viewed 19383 times)
- How fast does the Earth go at perihelion and aphelion? (viewed 19347 times)
- Can "tired light theory" explain the observed redshifts of galaxies? (viewed 19325 times)
- What is a Dyson Sphere? (viewed 19270 times)
- Do we know everything about the Sun? (viewed 19184 times)
- Wouldn't the Big Bang theory be considered a hypothesis and not a theory? (viewed 19184 times)
- How do we know what parameters to use when simulating the collision of the Milky Way and Andromeda? (viewed 19183 times)
- How can we measure distances to more stars? (viewed 19174 times)
- Is the Milky Way a collision of two galaxies? (viewed 19144 times)
- How do astronauts communicate with their families from space? (viewed 19121 times)
- Did I see the Aurora Borealis as a child? (viewed 19095 times)
- Do you believe in UFOs? (viewed 19082 times)
- How much can the location of sunset differ from due West? (viewed 19064 times)
- Is the Sun always up for exactly 12 hours at the equator? (viewed 19047 times)
- Is infinite temperature possible? (viewed 19027 times)
- Why are the compositions of comets and asteroids different? (viewed 18998 times)
- How can geometry be different in space? (viewed 18928 times)
- How does Astronomy involve Chemistry? (viewed 18912 times)
- Does the Sun have an iron surface? (viewed 18908 times)
- Can astronauts produce water in space? (viewed 18850 times)
- Is there such a thing as hyperspace? (viewed 18850 times)
- Why isn't the sky bright at night if the universe has so many stars? (viewed 18825 times)
- Will we ever stop having solar eclipses because of the moon's motion away from the Earth? (viewed 18796 times)
- What's so exciting about the new planet around 55 Cancri? (viewed 18793 times)
- Why does the SETI project search for radio signals? (viewed 18735 times)
- How many Astronauts have been in space? (viewed 18713 times)
- What does the term "visible universe" mean? (viewed 18703 times)
- Why do photos of space taken from space never show any stars? (viewed 18695 times)
- How do asteroids, meteors and comets disappear? (viewed 18671 times)
- Will the seasons change due to precession? (viewed 18663 times)
- How do we know that superclusters are the largest structures in the universe? (viewed 18641 times)
- Do you think it's possible to maintain life on other planets? (viewed 18604 times)
- What type of energy does a black hole have? (viewed 18592 times)
- Why are there active volcanos on Io? (viewed 18551 times)
- Can you use an infinite line of reflectors to send light to the edge of the Universe? (viewed 18548 times)
- What is the farthest Northern Latitude in which the Magellanic Clouds can be seen? (viewed 18537 times)
- Do the magnitudes and colors of stars ever change? (viewed 18537 times)
- What's the object I saw that moved across the sky and then got very bright? (viewed 18503 times)
- When unmanned spacecraft accelerate in space, what causes them to slow down? (viewed 18489 times)
- How big was the Sun when it first "fired up"? (viewed 18481 times)
- Is it true that the Sun burns off a billion tons of gas every 5 seconds? (viewed 18471 times)
- Was Stonehenge built to mark solar phenomena? (viewed 18469 times)
- Are there any dark stars or dark galaxies made of dark matter? (viewed 18414 times)
- What supernova created the Crab nebula? (viewed 18390 times)
- Have gravitational waves been proven to exist? (viewed 18381 times)
- When are there 5 Sundays in February? (viewed 18376 times)
- How do scientists slow light down? (viewed 18375 times)
- Why do clocks turn in the opposite direction from the Earth and Moon? (viewed 18372 times)
- Do astronomers believe in astrology? (viewed 18357 times)
- How do we determine the age of the universe? (viewed 18355 times)
- Who (and when) discovered that the earth's axis is on a 23 degree tilt? (viewed 18332 times)
- Why does the Sun appear larger on the horizon than overhead? (viewed 18326 times)
- How do we know the Milky Way is a spiral galaxy? (viewed 18274 times)
- Why are Saturn's rings flat? (viewed 18229 times)
- What happens when an antimatter black hole collides with a matter blackhole? (viewed 18192 times)
- How can we know that there are other galaxies if we cannot leave ours? (viewed 18170 times)
- What process would bring about a quark star? (viewed 18168 times)
- Is there a project I can do on black holes? (viewed 18140 times)
- Why are most months 30 or 31 days long? (viewed 18098 times)
- Can astronauts play musical instruments in space? (viewed 18042 times)
- Did a giant impact cause the Dark Ages? (viewed 18026 times)
- Why do we assume that the universe is homogeneous? (viewed 17939 times)
- Why do we study black holes? (viewed 17911 times)
- Why do astronauts in space need to exercise? (viewed 17910 times)
- How are planets detected around other stars? (viewed 17861 times)
- What caused Shoemaker-Levy 9 to split up? (viewed 17851 times)
- Which way does the sun travel in the southern hemisphere? (viewed 17811 times)
- Can supernovae hinder the formation of life in galaxies? (viewed 17783 times)
- Why is the shadow on the Moon the shape it is? (viewed 17773 times)
- What are "blue stragglers" in globular clusters? (viewed 17772 times)
- How are galaxies and solar systems similar? (viewed 17738 times)
- Is it worthwhile to continue the search for extraterrestrial life? (viewed 17706 times)
- How is it proved that the Universe is expanding? (viewed 17686 times)
- How do planets capture satellites? (viewed 17643 times)
- Why are there no craters on Earth? Did all the meteorites miss us? (viewed 17587 times)
- What is sidereal time? (viewed 17584 times)
- Why are stars of different masses? (viewed 17576 times)
- How close does a supernova need to be to damage the Earth's environment? (viewed 17573 times)
- What are the names of the three stars in Orion's belt? (viewed 17560 times)
- Is there a list of the sizes of different kinds of stars? (viewed 17521 times)
- What is the solar cycle? (viewed 17501 times)
- What's the best thing about being an astronomer? (viewed 17474 times)
- Does Cerenkov radiation travel faster than light? (viewed 17421 times)
- Would extraterrestrial civilizations know that there is life on Earth? (viewed 17418 times)
- Why is Uranus tipped on its side? (viewed 17387 times)
- What happens to the material that has been sucked into a black hole? (viewed 17380 times)
- What calculations go into predicting eclipses? (viewed 17374 times)
- How long does it take the Big Dipper to move in the sky? (viewed 17330 times)
- What would happen if there was a collision between two white dwarfs? (viewed 17295 times)
- How can we see galaxies if their stars are so faint? (viewed 17274 times)
- Could we send a space mission to a comet? (viewed 17234 times)
- Could a different theory of gravity explain the dark matter mystery? (viewed 17233 times)
- Why do humans want to go in space? (viewed 17223 times)
- Why is the Hubble Space Telescope in space? (viewed 17211 times)
- Is there sound coming from the Sun? (viewed 17155 times)
- Why doesn't light from distant galaxies reach us instantaneously? (viewed 17154 times)
- Why do so many of the world's UFO sightings happen in America? (viewed 17151 times)
- Can two lunar eclipses occur in the same month? (viewed 17137 times)
- How do solar flares affect airline pilots? (viewed 17132 times)
- What happens when you change the mass of a White Dwarf or Neutron Star? (viewed 17129 times)
- Are there stars outside of galaxies? (viewed 17126 times)
- How do we know that sunspots are associated with the Sun's magnetic field? (viewed 17087 times)
- What will happen to the Milky Way in the future? (viewed 17085 times)
- If we invented special suits could we ever go to the sun? (viewed 17047 times)
- How do I explain to my children why the Moon has phases? (viewed 17040 times)
- How do I polar align my telescope? (viewed 17039 times)
- How can we compare dark matter and dark energy? (viewed 17039 times)
- A line drawn perpendicular to a line through the tips of the horns of the crescent moon doesn't point to the Sun! Why not? (viewed 17036 times)
- Can you tell time by the Big Dipper? (viewed 17026 times)
- How different would the night sky have looked in 40,000 B.C.? (viewed 17012 times)
- What kind of eyepieces do I need to look at planets? (viewed 17007 times)
- Is there any possibility that the Solar System or the Universe is in a black hole? (viewed 16976 times)
- As the universe expands, why don't galaxies get stretched out? (viewed 16943 times)
- Could we be seeing dead stars? (viewed 16943 times)
- Can double stars have planets? (viewed 16940 times)
- Why is the time between two successive full moons different from the lunar synodic month? (viewed 16912 times)
- What colors are visible through an amateur telescope? (viewed 16867 times)
- Are the properties of extrasolar planets known? (viewed 16845 times)
- How do we feel heat? (viewed 16766 times)
- Why does one side of Mars look more catastrophic than the other? (viewed 16737 times)
- Do similar laws of physics throughout the Universe imply that all life must be like life on Earth? (viewed 16734 times)
- How do sunrise and sunset times change with altitude? (viewed 16721 times)
- How powerful are quasars? (viewed 16710 times)
- How are asteroid compositions and classifications determined? (viewed 16683 times)
- How do we know if the universe will keep expanding forever? (viewed 16680 times)
- What month was it when Odysseus saw Orion in 1000BC? (viewed 16626 times)
- What is a wormhole? (viewed 16603 times)
- Could our position in the universe affect our perceptions of the expansion? (viewed 16600 times)
- How many comets are currently orbiting our sun? (viewed 16558 times)
- Do unmanned spacecraft like Voyager travel in straight lines? (viewed 16547 times)
- Are the planes of solar systems aligned with the plane of the Galaxy? (viewed 16484 times)
- Could you escape from a black hole if you were able to go faster than the speed of light? (viewed 16466 times)
- Can I see details on Venus? (viewed 16441 times)
- What kind of telescope should I use for astrophotography? (viewed 16405 times)
- Does inflation allow for an infinite number of universes? (viewed 16400 times)
- What happened to all the black holes that were around in the early universe? (viewed 16355 times)
- Can a black hole come back to the visual universe through a "little bang"? (viewed 16327 times)
- Can I see a quasar? (viewed 16294 times)
- What equipment do I need for astrophotography? (viewed 16286 times)
- Where does the kinetic energy of infalling bodies come from? (viewed 16279 times)
- Can any comparison be made between spiral galaxies and hurricanes? (viewed 16269 times)
- Can the theory of formation of the solar system explain all the observables? (viewed 16259 times)
- How many sunspots can the Sun have at once? (viewed 16237 times)
- What kind of instruments are used to detect extrasolar planets? (viewed 16172 times)
- How does the Earth compare in size to the entire universe at the present epoch? (viewed 16156 times)
- How do I become an astronomical artist? (viewed 16082 times)
- Can other terrestrial moons be (or have been) stable? (viewed 16059 times)
- How long do supernova remnants last? (viewed 16057 times)
- Why did the Pioneer and Voyager take only 2 years to reach Jupiter, while Galileo and Cassini took more than 5 years? (viewed 16044 times)
- Does a photon observe other photons moving past it at the speed of light? (viewed 16037 times)
- Why search for only Earth-like life on other planets? (viewed 15948 times)
- Why does the apparent density of galaxies drop off at larger distances? (viewed 15935 times)
- Why can we see the sun's image before sunrise and after sunset? (viewed 15926 times)
- Can I build an instrument to measure the size of the Sun and of the Moon? (viewed 15920 times)
- How can you tell if a crescent moon is preceding or following a new-moon phase? (viewed 15901 times)
- Why is the Cosmic Microwave Background not absorbed by interstellar hydrogen? (viewed 15900 times)
- How are supernovae discovered? (viewed 15884 times)
- Could there have been multiple Big Bangs at different places in the universe? (viewed 15866 times)
- Would the biggest airplanes cause tsunamis if they crashed? (viewed 15861 times)
- Did I really hear a meteor? (viewed 15845 times)
- What makes a satellite geosyncronise itself with Earth's orbit? (viewed 15841 times)
- Are there any new craters on the moon? (viewed 15810 times)
- Which part of the sky did the famous 'wow' signal originate from? (viewed 15766 times)
- Can gravitational lensing from intervening galaxies cause the observed ripples in the Cosmic Microwave Background? (viewed 15765 times)
- If clocks run slow in a gravitational field, how can we know the true age of the Solar System and Universe? (viewed 15734 times)
- Is it possible for amateurs to do optical interferometry? (viewed 15718 times)
- Why are there blue shifted galaxies? (viewed 15709 times)
- Is the universe really like an expanding balloon? (viewed 15708 times)
- How was the starting point for the Julian Date system chosen? (viewed 15699 times)
- Why do some eclipses take longer than others? (viewed 15695 times)
- What is meant by "stopping down a telescope"? (viewed 15680 times)
- How is the Cepheid yardstick validated? (viewed 15673 times)
- Are planetary nebulae the result of supernovae? (viewed 15561 times)
- Can you give me advice on buying a telescope? (viewed 15553 times)
- Why was the Platonic year named after Plato? (viewed 15541 times)
- Why doesn't NASA build rotating spacecraft to simulate gravity? (viewed 15499 times)
- Is there a beginning and an end to a galaxy's life? (viewed 15473 times)
- Will we discover an 11th planet? What would it be called? (viewed 15371 times)
- Why doesn't the hydrogen on Jupiter explode? (viewed 15346 times)
- Is it possible to build a cheap device to measure declination? (viewed 15322 times)
- Would a planet near the galactic center have a brighter night sky? (viewed 15315 times)
- Can you describe a day on the job as an astronomer? (viewed 15284 times)
- What is the difference between homogeneity and isotropy? (viewed 15278 times)
- Did time go slower just after the Big Bang? (viewed 15276 times)
- How hot is each one of the layers of the sun? (viewed 15236 times)
- What class of spiral galaxy is the Milky Way? (viewed 15230 times)
- On which days can I see the Moon in the evening / morning and why is this so? (viewed 15201 times)
- What is a Cepheid variable? (viewed 15194 times)
- What would the Big Crunch look like to an observer on Earth? (viewed 15182 times)
- If comets are boiling away, why are there any left? (viewed 15174 times)
- Why don't astronauts sublimate in space? (viewed 15163 times)
- How can we tell what the interiors of planets are like? (viewed 15143 times)
- Could you tell me about the life cycle of galaxies? (viewed 15110 times)
- Can the Space Shuttle abort and return to Earth before reaching orbit? (viewed 15098 times)
- What happened to the girl who named Pluto? (viewed 15077 times)
- How do astronomers come up with their facts? (viewed 15069 times)
- How are sunspots formed? (viewed 15055 times)
- Why is pressure broadening greater in low mass stars than in high mass stars? (viewed 15002 times)
- Where can I find information on the moons of other planets? (viewed 14977 times)
- Why aren't discoveries of extrasolar planets reported on the news? (viewed 14953 times)
- Will I be able to see the shadow of the Moon streaking towards me in a total solar eclipse? (viewed 14950 times)
- Could dark energy come from matter anti-matter pairs forming spontaneously and then annihilating? (viewed 14935 times)
- What is the SU(3) quark model? (viewed 14915 times)
- What is our galaxy's halo made of, and how was it formed? (viewed 14906 times)
- Does the shuttle worry about space junk? (viewed 14864 times)
- Can astronomers observe anything when the moon is full? (viewed 14787 times)
- Can HST see the Oort cloud? (viewed 14768 times)
- What is the origin of the stellar classification system "OBAFGKM"? (viewed 14768 times)
- Can the acceleration of the Universe be analogous to apparent acceleration in a airplane? (viewed 14710 times)
- Do galaxies orbit around anything? (viewed 14707 times)
- How are astronomy and poetry linked? (viewed 14692 times)
- What are the boundaries of the constellations? (viewed 14656 times)
- Why is NASA shutting down the Hubble Space Telescope? (viewed 14649 times)
- Does the Sun have any heavy elements? (viewed 14571 times)
- What's new with the Big Bang? (viewed 14566 times)
- Why do supernova remnants look like rings rather than spheres? (viewed 14533 times)
- Why doesn't SETI concentrate its observations to the nearby stars and the solar systems that we are discovering? (viewed 14471 times)
- Have astronomers observed any phenomena that could be produced by extraterrestrial civilizations? (viewed 14456 times)
- How could galaxies have gotten so far away in only 15 billion years? (viewed 14443 times)
- How can we find galaxies behind the Milky Way? (viewed 14435 times)
- Why are telescopes kept in cold conditions? (viewed 14386 times)
- What is the best time of the year to see eclipses? (viewed 14368 times)
- Can I listen to the SETI@home radio signal? (viewed 14325 times)
- Did I find a rock that came from the Moon? (viewed 14299 times)
- Where was the water in the big bang? (viewed 14294 times)
- How can the Sun have such a strong gravitational field if it's made of gasses? (viewed 14292 times)
- Could photons be dark matter? (viewed 14249 times)
- Why are there more maria on the near side of the Moon? (viewed 14238 times)
- How do astronomers measure the radius of a star? (viewed 14228 times)
- Why can't relative velocities add up to more than the speed of light? (viewed 14214 times)
- Is light of different colors affected differently by gravity? (viewed 14207 times)
- How long is twilight on the Moon? (viewed 14177 times)
- Do stars' orbits in galaxies obey Kepler's Laws? (viewed 14101 times)
- Does the temperature of matter increase as it is accelerated to relativistic speeds? (viewed 14013 times)
- How fast do particles travel in space? (viewed 13971 times)
- How do bars form in spiral galaxies? (viewed 13963 times)
- What would an "open geometry" for the universe look like? (viewed 13945 times)
- What causes gamma ray bursts? (viewed 13943 times)
- How long has humanity known that we live in a galaxy similar to others in the Universe? (viewed 13935 times)
- How do we know what other planets (and stars, galaxies, etc.) are made of? (viewed 13918 times)
- Do we see the same stars from above and below the equator? (viewed 13902 times)
- What was that eclipse I saw in the sky? (viewed 13887 times)
- What causes a particle to decay? (viewed 13863 times)
- How much power is contained in a beam of light? (viewed 13772 times)
- How do photons from distant objects maintain enough energy to reach us? (viewed 13763 times)
- How do we find out about the star formation histories of galaxies? (viewed 13717 times)
- Can we make a movie of the Milky Way galaxy's rotation? (viewed 13699 times)
- Will the diameter of a cluster of galaxies change with redshift? (viewed 13665 times)
- Will the next generation telescope OWL be able to detect an Earth like extrasolar planet? (viewed 13661 times)
- Why is it important to study meteorites? (viewed 13634 times)
- How do you classify galaxies? (viewed 13492 times)
- Are the asteroids the remains of a planet which broke apart? (viewed 13479 times)
- Can you tell me the characteristics of W, R, N and S type stars? (viewed 13472 times)
- What are "curled" dimensions? (viewed 13466 times)
- Why are accretion disks flat? (viewed 13450 times)
- When did people discover that the Sun is a star? (viewed 13439 times)
- What do "homogeneity" and "isotropy" mean? (viewed 13437 times)
- What kinds of star clusters are there? (viewed 13389 times)
- How can I contribute to science as an amateur astronomer? (viewed 13370 times)
- Did the Sumerians measure precession? (viewed 13323 times)
- Is there oxygen in the atmospheres of other planets? (viewed 13300 times)
- How can we understand the meaning of large numbers like "a million million?" (viewed 13279 times)
- Wouldn't the vast distances of space distort SETI signals into unintelligeble forms? (viewed 13187 times)
- What kind of interference must astronomers contend with when observing? (viewed 13185 times)
- Will the Leonid meteor shower go away? (viewed 13143 times)
- How does interferometry work? (viewed 13122 times)
- Do we have to worry about relativity when studying galactic objects? (viewed 13106 times)
- Could we send a manned mission to the outer planets? (viewed 13038 times)
- Why are telescopes located in remote places? (viewed 13037 times)
- Do electrons age? (viewed 13029 times)
- Why can we have solar eclipses? (viewed 13002 times)
- What do stellar classifications mean? (viewed 12990 times)
- How do distant galaxies differ from those nearby? (viewed 12894 times)
- What is the best way to see the Milky Way? (viewed 12808 times)
- What is the farthest in space that we have gone? (viewed 12801 times)
- How do astronomers observe the Sun's interior? (viewed 12738 times)
- How can I watch the Perseid meteor shower? (viewed 12705 times)
- Why do spacecraft need heat shields coming back to Earth but not leaving? (viewed 12680 times)
- How does melting a material reset its radioactive clock? (viewed 12662 times)
- Will astronauts ever be able to go ice-skating on Europa? (viewed 12661 times)
- How are astronauts trained for weightlessness? (viewed 12621 times)
- What is the three-body problem? (viewed 12576 times)
- How can I nominate myself for a Nobel Prize in Physics? (viewed 12507 times)
- How can you tell the difference between single and multiple extrasolar planets? (viewed 12497 times)
- How are photons created and destroyed? (viewed 12487 times)
- How did Mars get so dusty? (viewed 12486 times)
- Is cosmic expansion happening on microscopic scales? (viewed 12462 times)
- Do we really observe the edges of galaxies at different epochs? (viewed 12367 times)
- How does a star take mass from another star? (viewed 12332 times)
- Where can I see Newton's original reflecting telescope? (viewed 12266 times)
- How can I find out if the new moon has been sighted? (viewed 12081 times)
- How can water be chemically trapped in rocks? (viewed 12042 times)
- Why is the WMAP picture of the CMB an ellipse? (viewed 12006 times)
- If the universe is "bounded" today, could it one day become "unbounded"? (viewed 11964 times)
- Do binary or triple star systems form together? (viewed 11957 times)
- Do asteroids hit the sun? (viewed 11883 times)
- Is light blueshifted when it is gravitationally lensed? (viewed 11698 times)
- How does libration allow us to see more than 50% of the Moon? (viewed 11697 times)
- What percent of the time can astronomers observe without interference from the Moon? (viewed 11690 times)
- Why will fusion wait until hydrogen is gone before starting to fuse heavier atoms? (viewed 11666 times)
- Is the Local Group expanding along with the entire Universe? (viewed 11648 times)
- No matter how fast the universe is expanding, shouldn't gravity eventually make it recollapse? (viewed 11413 times)
- What color would Mars be if you were standing on it? (viewed 11412 times)
- What kinds of cancer research have been done in space? (viewed 11353 times)
- How do unmanned space probes avoid running into things? (viewed 11344 times)
- If the Universe was infinitely dense at the Big Bang, why didn't time stand still? (viewed 11281 times)
- What is "nothing", from a scientific point of view? (viewed 11271 times)
- Do asteroids ever do anything good in the Solar System? (viewed 11265 times)
- Why aren't accretion disks around giant stars as hot as accretion disks around black holes? (viewed 11136 times)
- What is Hot Dark Matter theory? (viewed 11012 times)
- How can observations of the distant universe prove that the expansion is accelerating *now*? (viewed 11002 times)
- Why is it easier to see a star if you look slightly to the side? (viewed 10902 times)
- What would happen if you went back in time and killed your grandmother? (viewed 10882 times)
- Could matter-anti-matter repulsion power the expansion of the universe? (viewed 10841 times)
- How can the universe be "flat"? We're 3D! (viewed 10730 times)
- What do meteorites tell us about life on other planets? (viewed 10470 times)
- What is the photoelectric effect? Why can't multiple low-frequency photons free an electron? (viewed 10418 times)
- Why is it called astronomy when all the other sciences end in -ology? (viewed 10371 times)
- Could neutrinos be dark matter? (viewed 10307 times)
- Why don't all neutron stars become pulsars? (viewed 10306 times)
- What are collections of galaxies called? (viewed 10286 times)
- Are there any 'lonely galaxies'? (viewed 10189 times)
- How are planets affected by the Hot Ionised Medium? (viewed 10125 times)
- Can a human give birth in space? (viewed 10113 times)
- What was different on Mars in the past to allow liquid water to be present? (viewed 9983 times)
- What is the relationship between the width of a star trail on a photo and the star's intensity? (viewed 9929 times)
- How can we discern different galaxies/clusters along the same line of sight? (viewed 9845 times)
- During close approaches, can Mars appear in our sky as large as the Moon? (viewed 9766 times)
- Why doesn't the ammonia and methane in Jupiter's atmosphere sink into the core? (viewed 9676 times)
- Why was Mir burnt up in the atmosphere? (viewed 9608 times)
- Do constellations looks the same from space? (viewed 9563 times)
- What are the largest radio wavelengths observed from radio sources in the sky? (viewed 9304 times)
- How does the color index of a star relate to its actual color? (viewed 8977 times)
- Does lunar gardening really work? (viewed 8924 times)
- Is it a coincidence that we can have total solar eclipses? Are there other planets which also have them? (viewed 8837 times)
- Do the Earth's magnetic poles ever change places? (viewed 8723 times)
- Why is the sky blue and not blue & purple? (viewed 8614 times)
- How big is the Hubble Ultra Deep Field image? (viewed 8614 times)
- How do we detect incoming meteorites? (viewed 8456 times)
- Could the Universe's dark matter be made up of black holes? (viewed 8283 times)
- Is the green flash real? (viewed 8116 times)
- If nothing can escape a black hole, why do some black holes have jets? (viewed 7551 times)
- If the sun went out and our atmosphere froze solid, what color would it be? (viewed 7508 times)
- Does weightlessness affect hunger? (viewed 7466 times)
- How do we know the density of some extrasolar planets? (viewed 6846 times)
- Can we harvest H & O from space to make water? (viewed 6160 times)
- Can the sun rise from the west on Mars? (viewed 6061 times)
- What would happen if a human were exposed to space without wearing a spacesuit? (viewed 5850 times)
- What is between the Oort cloud and the closest star? (viewed 5566 times)
- Are black holes spherical? (viewed 5531 times)
- Has anyone ever seen a star "turn on"? (viewed 5161 times)
- Why don't skydivers burn up like meteors? (viewed 4697 times)
- Did the Moon or planets form in a manner similar to that of Earth? (viewed 4545 times)
- When measuring the expansion of the universe, do astronomers consider that they're seeing how galaxies moved long ago, not today? (viewed 4495 times)
- What would happen if a nuclear-powered shuttle exploded? (viewed 4458 times)
- Does the Milky Way spin counter-clockwise? If so, do all spiral galaxies spin in this direction and why? (viewed 4239 times)
- Can we prove that the Moon isn't hollow? (viewed 4234 times)
- When will Hale-Bopp return? (viewed 4146 times)
- Could a planetary system survive if its star merged with another, or if its star went supernova? (viewed 4145 times)
- Why are craters round? (viewed 3918 times)
- Is it sensible to consider terraforming Mars? (viewed 3795 times)
- Do planets radiate noise? (viewed 3682 times)
- How do supernovae show us that the Universe's expansion is accelerating? (viewed 3643 times)
- Can planets collide with one another? (viewed 3424 times)
- If there are infinity universes, will every thing that is possible happen? (viewed 3176 times)
- Are there solar tides? (viewed 3146 times)
- When will humans travel to Mars and revisit the Moon? (viewed 3038 times)
- Will the Pioneer and Voyager probes ever leave the Milky Way? (viewed 2317 times)
- Where is the Spitzer Space Telescope? (viewed 2271 times)
- If I were traveling through space, could I see distant galaxies with my own eyes? (viewed 2089 times)
- Does the particles involved in a star's final core collapse travel faster than the speed of light? (viewed 1819 times)
- Is Earth-moon tidal friction causing global warming? (viewed 1699 times)
- Do more meteorites fall at low latitudes? (viewed 1623 times)
- Is the moon spherical? (viewed 1370 times)
- When is the best time to observe zodiacal light? (viewed 1259 times)
- Why does Titan, in spite of being smaller than Mars, have an atmosphere more dense than Earth's? (viewed 1247 times)
- The naming of Mars (viewed 1201 times)
- Is the reddish dust of Mars biogenic? (viewed 1141 times)
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