All previously answered questions (in order of times viewed)

What's going to happen on December 21st 2012? (viewed 367418 times)
What color is each planet? (viewed 312139 times)
Is the Moon moving away from the Earth? When was this discovered? (viewed 259248 times)
How far is each planet from Earth? (viewed 223591 times)
How do I build a model rocket? (viewed 214561 times)
How many stars are there in our Galaxy (Milky Way)? (viewed 190217 times)
What is the life cycle of a star? (viewed 188350 times)
How do you measure the distance between Earth and the Sun? (viewed 175373 times)
What is the largest star? (viewed 172891 times)
What is a white hole? (viewed 160132 times)
What color is Venus? (viewed 150821 times)
Why do the planets orbit the sun? (viewed 137106 times)
Which planets have rings? (viewed 135736 times)
At what speed does the earth move around the sun? (viewed 133460 times)
What are the names of the earth, moon, sun, and solar system? (viewed 114944 times)
What makes the Earth rotate? (viewed 109865 times)
Is the distance from the Earth to the Sun changing? (viewed 108744 times)
Why do stars twinkle? (viewed 107818 times)
What do astronauts eat in space? Can they grow food? (viewed 100859 times)
What is the universe expanding into? (viewed 100166 times)
Does the Moon rotate? Are there other moons that always keep one face toward their planet? (viewed 98992 times)
Is Pluto a planet? (viewed 97558 times)
How long does it take for the Sun's light to reach us? (viewed 90483 times)
Why do planets rotate? (viewed 89330 times)
Where did the name 'Earth' come from? (viewed 87848 times)
Will the sun go supernova in six years and destroy Earth (as seen on Yahoo)? (viewed 83743 times)
What are shooting stars? (viewed 83675 times)
What is the largest galaxy? (viewed 82326 times)
Why are there both high and low tides? (viewed 81135 times)
Who named the planets and who decides what to name them? (viewed 79663 times)
How many known galaxies are there? (viewed 78048 times)
When will Halley's Comet return? (viewed 73252 times)
How do we know the age of the Universe and the Earth? (viewed 67319 times)
What was there before the Big Bang and what is there outside of our universe? (viewed 66881 times)
How does the location of sunrise and sunset change throughout the year? (viewed 66729 times)
How critical is the Earth-Sun distance in maintaining our average temperatures on Earth? (viewed 66394 times)
When is the next comet due to arrive? (viewed 64857 times)
Is the Sun expanding? Will it ever explode? (viewed 64744 times)
How many Earths fit into the Sun? (viewed 64299 times)
Can you hear sounds in space? (viewed 61990 times)
Will the magnetic field of the Earth reverse its direction in the future? Will this cause problems? (viewed 61539 times)
What would happen if an impact caused Earth to stop rotating? (viewed 61079 times)
Are there telescopes that can see the flag and lunar rover on the Moon? (viewed 58361 times)
Have astronomers discovered Earth's second moon? (viewed 57379 times)
What would happen if we did not have a Moon? (viewed 57312 times)
What is the hottest time of day? (viewed 56588 times)
How does the position of Moonrise and Moonset change? (viewed 56179 times)
Did astronauts really go to the Moon, or is it a hoax? (viewed 56051 times)
What kind of rock is the moon made of? (viewed 56010 times)
What is apparent magnitude? (viewed 55163 times)
What will happen to life on Earth when the Sun becomes a red giant? (viewed 54741 times)
What is at the end of the Universe? (viewed 54655 times)
How do stars move in the Galaxy? (viewed 54286 times)
Can I buy a star? (viewed 53720 times)
What is that ring (or rainbow) around the moon? (viewed 53490 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 52802 times)
What is the observational difference between a star and a planet? (viewed 52676 times)
Is the universe expanding faster than the speed of light? (viewed 51946 times)
Why is a day divided into 24 hours? (viewed 51300 times)
Who has landed on the moon? (viewed 50917 times)
Does the Sun orbit the Earth as well as the Earth orbiting the Sun? (viewed 50769 times)
Can we feel the Earth spin? (viewed 50097 times)
How long does a solar eclipse last? (viewed 49508 times)
What is the physical difference between a star and a planet? (viewed 48056 times)
What direction do planets rotate? (viewed 47954 times)
What happens when galaxies collide? (viewed 47720 times)
How can I find the star I have "bought"? (viewed 47709 times)
How do astronauts take baths and use restrooms in space? (viewed 47708 times)
Does the Sun have a scientific name? (viewed 47696 times)
Does the Sun move around the Milky Way? (viewed 46567 times)
Does the Sun rotate? (viewed 46526 times)
How do you calculate the lifetime of the Sun? (viewed 46316 times)
Why aren't there any green stars? (viewed 45748 times)
How do rockets work? (viewed 45629 times)
Why are the Moon and Sun sometimes orange or red? (viewed 45252 times)
Is there a proof that Earth moves? (viewed 44811 times)
Can artificial gravity be created in space? (viewed 44390 times)
Why do planets have elliptical orbits? (viewed 44239 times)
Why are stars and planets round? (viewed 44122 times)
How can we see the Milky Way if we are inside it? (viewed 43892 times)
When can I see the Moon through the hole in the Pantheon? (viewed 43477 times)
How many constellations are there? (viewed 43407 times)
Do stars move in the sky? (viewed 43232 times)
What is a singularity? (viewed 43222 times)
What causes seasons? (viewed 43219 times)
How much money do astronomers make? (viewed 43037 times)
What elements make up the Sun? (viewed 43024 times)
Where does the name "Milky Way" come from? (viewed 42893 times)
What are the advantages and disadvantages of using a telescope in space? (viewed 42891 times)
What would happen if an asteroid 10 kilometers across hit the Earth? (viewed 42315 times)
How are light and heavy elements formed? (viewed 42215 times)
What are the "dog days of summer"? (viewed 42145 times)
Since Earth is spinning, why do we land in the same place when we jump or fall? (viewed 41915 times)
What is a nova? (viewed 41766 times)
How are black holes made? Could one be made close to us? (viewed 41690 times)
How does the Sun compare to other stars? (viewed 40940 times)
What is the mass of the Universe? (viewed 40687 times)
Why do airplanes take longer to fly West than East? (viewed 40425 times)
What is the largest structure in the universe? (viewed 40357 times)
Why doesn't the earliest sunset occur on the shortest day of the year? (viewed 40224 times)
Which planet is most similar to Earth? (viewed 40198 times)
Where did the Universe come from? (viewed 40172 times)
What is the size of the Solar System? (viewed 40074 times)
What are RA and DEC? (viewed 39965 times)
Who first measured the speed of light? (viewed 39635 times)
Why doesn't the length of each day change much around the solstices? (viewed 39520 times)
How much money is spent on space exploration? (viewed 39412 times)
What's the best college for astronomy? (viewed 39065 times)
Is time travel possible? (viewed 38398 times)
Why does the Earth have only one moon? (viewed 38375 times)
Is it possible to measure the temperature of the Sun? (viewed 38316 times)
Does your weight change between the poles and the equator? (viewed 38162 times)
Why is the Universe flat and not spherical? (viewed 38055 times)
What would happen if the gravity on Earth was suddenly turned off? (viewed 37703 times)
What would you see from inside a black hole? (viewed 37694 times)
Will the Sun become a black hole one day? (viewed 36977 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 36964 times)
How do astronomers use math in their jobs? (viewed 36908 times)
How many stars are born and die each day? (viewed 36883 times)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (viewed 36662 times)
Traveling at light speed, how long would it take to get to the nearest galaxy? (viewed 36517 times)
What happens to a substance if its speed is more than the speed of light? (viewed 36490 times)
Where are stars born? (viewed 36419 times)
What is the density of a black hole? (viewed 36367 times)
Could there be life in the galaxies nearest to the Milky Way? (viewed 36257 times)
How often does the Sun pass through a spiral arm in the Milky Way? (viewed 36156 times)
When was the last time all 9 planets were aligned? (viewed 36060 times)
What would happen if a supermassive black hole came close to the Earth? (viewed 36047 times)
Do most astronomers believe in God based on the available scientific evidence? (viewed 36029 times)
How are galaxies formed? (viewed 35917 times)
Does the Moon rotate? (viewed 35766 times)
Do black holes die? If so how? (viewed 35708 times)
What are some astronomy science fair projects? (viewed 35644 times)
How did the stars get named? (viewed 35395 times)
How do we know the mass of the Earth and the Moon? (viewed 34929 times)
What is the shape of the universe? (viewed 34886 times)
What kinds of jobs do astronomers do? (viewed 34675 times)
If the universe is infinite does that mean there is an infinite number of "me"s? (viewed 34658 times)
What makes the wind? (viewed 34543 times)
Are names given to black holes? (viewed 34367 times)
Why isn't the summer solstice the hottest day of the year? (viewed 34341 times)
What are constellations used for? (viewed 34332 times)
How can I find the distance to the Sun on any given day? (viewed 34012 times)
Why do different stars appear with seasons? (viewed 33862 times)
How does the parachute in a model rocket work? (viewed 33821 times)
When the Sun converts mass to energy, do the orbits of the planets change? (viewed 33815 times)
What would happen to us if the sun went out for an hour? (viewed 33595 times)
Why is the Moon so bright? (viewed 33426 times)
What do astronauts do all day in the International Space Station? (viewed 33050 times)
Are aliens or UFOs real? (viewed 33007 times)
Does gravity vary across the surface of the Earth? (viewed 32896 times)
What are black holes made of? (viewed 32870 times)
Where does the name "Moon" come from? (viewed 32838 times)
Why do planets not twinkle? (viewed 32829 times)
Considering the motion of the Earth, the solar system, and the galaxy, how fast am I moving while lying in bed asleep? (viewed 32625 times)
What are Altitude and Azimuth? (viewed 32613 times)
Are there any asteroids on a collision course with Earth? (viewed 32543 times)
How do astronomers measure the brightness of stars? (viewed 32244 times)
Was the Sun made in a supernova? (viewed 32201 times)
What is the biggest crater recorded on Earth? (viewed 32177 times)
How long would it take the Earth to fall into the Sun? (viewed 32152 times)
How can the Universe expand faster than the speed of light during inflation? (viewed 32144 times)
Why is it difficult to understand the expansion of the universe? (viewed 32141 times)
Who discovered each planet? (viewed 32096 times)
How did asteroids form and what is the difference between an asteroid and a comet? (viewed 32068 times)
How does the Moon stay "suspended" in the air? (viewed 32057 times)
How can I measure the distance of a star? (viewed 31960 times)
Where, in relation to the entire universe, is the Milky Way located? (viewed 31797 times)
Why hasn't NASA gone back to the moon? (viewed 31592 times)
If light has no mass, then what draws it into a black hole? (viewed 31564 times)
How do astronauts use math in their jobs? (viewed 31454 times)
What can I use for fuel in my homemade rocket? (viewed 31438 times)
How do we measure the size of the Moon and of the Sun? (viewed 30889 times)
How do you calculate the azimuth and altitude of an object? (viewed 30730 times)
How do you measure a planet's mass? (viewed 30656 times)
Where is the nearest black hole? (viewed 30531 times)
Can you fire a gun on the Moon? (viewed 30527 times)
What are some of the effects of solar flares on Earth? (viewed 30521 times)
Can you see satellites? (viewed 30399 times)
What kind of schooling is necessary to become an astronomer? (viewed 30392 times)
What's the difference between astronomy and astrology? (viewed 30356 times)
Is the speed of light constant? (viewed 30328 times)
Why does the Moon look big on the horizon? (viewed 30326 times)
What is the size of a black hole? (viewed 30242 times)
Why does the Earth tilt back and forward once a year? (viewed 30135 times)
What is time dilation? (viewed 30072 times)
How is astronomy impacted by trigonometry? (viewed 29957 times)
How fast is the Universe expanding? (viewed 29830 times)
How big is the universe? (viewed 29735 times)
Do dead stars still shine? (viewed 29702 times)
What happens when two black holes get too close? (viewed 29695 times)
What do I need to do to become an astronomer? (viewed 29509 times)
Why can't you see stars during the day? (viewed 29470 times)
What other careers involve Astronomy besides Astronomer? (viewed 29440 times)
What would happen if Earth had more than one moon? (viewed 29415 times)
Can I buy land on the Moon? (viewed 29180 times)
How do you measure the mass of a star? (viewed 29172 times)
What makes up most of the Universe? (viewed 28866 times)
Can moons have moons? (viewed 28641 times)
How do rockets move in space? (viewed 28602 times)
Where is the supernova remnant that led to our solar system? (viewed 28502 times)
Why does Barnard 68 appear dark? (viewed 28462 times)
Why do all the planets orbit in the same plane? (viewed 28453 times)
Why does the Earth only see one side of the Moon? (viewed 28277 times)
How many meteorites hit Earth each year? (viewed 28227 times)
Would your weight change as you go underground? (viewed 28209 times)
What is the origin of spiral structure in galaxies? (viewed 28199 times)
How do gravitons escape black holes to tell the universe about their gravity? (viewed 28156 times)
How are elements heavier than iron formed? (viewed 28006 times)
Does Mt. Everest cast a shadow on the moon? (viewed 27970 times)
Where did the matter in the universe come from? (viewed 27955 times)
Can any galaxies be seen with the naked eye? (viewed 27945 times)
What is the most distant known galaxy? (viewed 27837 times)
Why is the moon in a different place every night? (viewed 27802 times)
Where did all the water in the universe come from? (viewed 27791 times)
Why do stars change colour when they twinkle? (viewed 27715 times)
Can we look back far enough in time to see the Big Bang? (viewed 27668 times)
Will we get sucked into the black hole at the center of the Milky Way? (viewed 27667 times)
Why do pictures of distant galaxies have higher resolution than those of nearby planets? (viewed 27609 times)
Can I calculate the size of the Universe by converting light years to kilometres? (viewed 27539 times)
What would happen if the Moon fell out of its orbit around Earth? (viewed 27369 times)
What is a star's "spectrum"? (viewed 27352 times)
How do galaxies collide in an expanding universe? (viewed 27242 times)
Why do the size and brightness of the full moon change? (viewed 27143 times)
What are the different kinds of astronomers? (viewed 27122 times)
What is a graviton? (viewed 27054 times)
How can two moons of Saturn share the same orbit? (viewed 27025 times)
Why do we see stars? (viewed 26937 times)
How can I calculate the position or path of the Sun for a given time and location? (viewed 26827 times)
How are black holes discovered? (viewed 26812 times)
What can we learn from the color of a star? (viewed 26539 times)
Why doesn't dark matter fall into a black hole? (viewed 26505 times)
What's the biggest meteorite? (viewed 26493 times)
Is the Great Wall the largest galaxy cluster? (viewed 26417 times)
What is the difference between a "star" and a "sun"? (viewed 26415 times)
What was that really big falling star that I saw? (viewed 26339 times)
Why can't we see Venus at night when it is an inner planet? (viewed 26258 times)
How can a star burn with no oxygen? (viewed 26099 times)
How does light pollution affect astronomers? (viewed 26070 times)
What is the speed of gravity? (viewed 26004 times)
How much longer will the Earth last? (viewed 25947 times)
What would happen to the Earth if an asteroid hit the Moon? (viewed 25901 times)
Why is sea water salty, and not lake water? (viewed 25811 times)
Could someone travel the universe in his or her own lifetime? (viewed 25803 times)
How many stars can I see? (viewed 25779 times)
How long has there been water on Earth? (viewed 25738 times)
Why is looking out the same as looking back in time? (viewed 25714 times)
Which constellation does our Sun belong to? (viewed 25659 times)
Why is twilight short near the equator? (viewed 25526 times)
Do the Sun's or Earth's magnetic field reverse? (viewed 25524 times)
What happens to a bullet fired on the moon? (viewed 25500 times)
Can terrestrial planets have rings? (viewed 25469 times)
Does quantum entanglement imply faster than light communication? (viewed 25365 times)
Why does the location of sunrise change? (viewed 25338 times)
Why are there stars? (viewed 25267 times)
How do I tell which planet is which? (viewed 25123 times)
Is the Earth slowly getting larger? (viewed 25105 times)
What is the typical size of a visible shooting star? (viewed 24913 times)
Is there really a 10th planet? (viewed 24885 times)
How long does the supernova stage of a star last? (viewed 24866 times)
How does night and day work? (viewed 24863 times)
How can I find my age on another planet? (viewed 24822 times)
Does the Mediterranean sea have tides? (viewed 24807 times)
Did life originate on Earth, or did it come from somewhere else? (viewed 24753 times)
What is the evidence supporting the nebula theory of Solar System formation? (viewed 24747 times)
What is Earthrise over the Moon? (viewed 24744 times)
Is the Moon hollow? (viewed 24661 times)
What's the difference between astronomy and astrophysics? (viewed 24630 times)
How close was the Moon to the Earth when it formed? (viewed 24622 times)
Which hemisphere has the best view of the Milky Way? (viewed 24621 times)
Do supermassive black holes cause galaxy rotation? (viewed 24594 times)
Does evolution contradict the second law of thermodynamics? (viewed 24583 times)
Is it possible to count the stars? (viewed 24538 times)
How can we estimate the number of Earth-like planets in the Galaxy? (viewed 24504 times)
Is time travel possible using merging black holes? (viewed 24465 times)
Is Andromeda part of the Milky Way? Where can I find them in the sky? (viewed 24445 times)
Is there a "South Star"? (viewed 24429 times)
Has there been an experiment that measured speed faster than the speed of light in vacuum? (viewed 24389 times)
What is the approximate GPA needed in High School in Math and Science to be an astronomer? (viewed 24376 times)
Why have star signs shifted by one constellation? (viewed 24321 times)
Why don't astronomers use everyday units to measure distances (what is an AU or a pc)? (viewed 24305 times)
Why does the Sun's apparent path through the sky change throughout the year? (viewed 24172 times)
Are meteorites hot or cold when they hit Earth? (viewed 24018 times)
Does the Coriolis force determine which way my toilet drains? Does it affect black holes? (viewed 23934 times)
How long would it take for a mini-black hole to eat the Earth? (viewed 23863 times)
Why is our solar system so different from all the others we've found? (viewed 23703 times)
How can I calculate distances between stars? (viewed 23685 times)
Why do we not have eclipses every month? (viewed 23667 times)
Could the Universe have expanded faster than the speed of light at the Big Bang? (viewed 23660 times)
When we look back to the Big Bang, why don't we see the universe as a tiny speck of matter? (viewed 23623 times)
How would the weather on Earth be different if it were a cube? (viewed 23599 times)
Can I communicate faster than light? (viewed 23588 times)
What skills do astronomers need? (viewed 23551 times)
Is the Earth at the centre of the Universe? (viewed 23545 times)
What is a dimension? (viewed 23521 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 23476 times)
Is it possible to see the full Moon and the Sun simultaneously in high northern latitudes when the Sun doesn't set? (viewed 23445 times)
Which American colleges teach astronomy? (viewed 23332 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 23185 times)
Can you see the future as you fall into a black hole? (viewed 23179 times)
Can a person go into a black hole and come out alive? (viewed 23082 times)
What is the difference between nutation and precession of the Earth? (viewed 23061 times)
If a white dwarf is a "dead" star, why is it so hot? (viewed 23042 times)
Are all stars the same? (viewed 23010 times)
How is the time of sunrise calculated? (viewed 23008 times)
What are the closest and/or brightest stars? (viewed 22925 times)
Can we colonize other planets? (viewed 22876 times)
What is the pattern to the distances between each planet and the sun? (viewed 22853 times)
How does the brightness of a star depend on its distance from us? (viewed 22830 times)
Why doesn't gravity change the speed of light? (viewed 22815 times)
Is there any limitation to what a black hole can "suck" in? (viewed 22782 times)
How many moles of stars are in the known universe? (viewed 22703 times)
What are the requirements for being a planet? (viewed 22654 times)
Are time machines possible? (viewed 22607 times)
What would happen if you took off your helmet in space? (viewed 22551 times)
What is the difference between the "Doppler" redshift and the "gravitational" or "cosmological" redshift? (viewed 22546 times)
What is happening just around the black hole in the center of the Milky Way? (viewed 22527 times)
What's the difference between dark matter and dark energy? (viewed 22491 times)
How dangerous are the asteroids? (viewed 22452 times)
Is there a simple formula to calculate solar eclipse timings from any position on Earth? (viewed 22382 times)
How do we define distance in an expanding universe? (viewed 22306 times)
How is it that we see farther out in space (farther back in time) than in the past? (viewed 22259 times)
If the universe is 15 billion years old, how can it be larger than 15 billion light years across? (viewed 22171 times)
What is the significance of the second focus of elliptical orbits of planets in our Solar System? (viewed 22146 times)
What happens to spacetime inside a black hole? (viewed 22142 times)
Can a lunar and a solar eclipse happen in the same month? When will this happen next? (viewed 22139 times)
How does astronomy benefit humankind? (viewed 22117 times)
What companies or businesses can astronomers work for? (viewed 22087 times)
How do we know that nuclear fusion is still going on in the Sun? (viewed 22009 times)
Could an astronaut or satellite fall into a black hole that we didn't know about? (viewed 21942 times)
Can we find the place where the Big Bang happened? (viewed 21937 times)
The Moon slows the Earth's rotation, but how fast was it spinning billions of years ago? (viewed 21843 times)
How long could life on Earth survive if the Sun stopped shining? (viewed 21839 times)
What's that dark spot on the Sun? (viewed 21812 times)
Are Earth and the Moon "twin planets"? (viewed 21765 times)
If gravity is a "curvature of space" rather than a force, why do a ball and bullet follow different paths? (viewed 21735 times)
Why do people draw stars with five points? (viewed 21726 times)
How do I make a scale model of the Solar System? (viewed 21700 times)
Are Kuiper Belt Objects asteroids? Are large Kuiper Belt Objects planets? (viewed 21686 times)
How do we weigh objects in space? (viewed 21676 times)
How are galaxy distances inferred from their recessional velocities? (viewed 21600 times)
How will the two black holes that are going to collide affect Earth? (viewed 21596 times)
What are the facts about the Star of Bethlehem? (viewed 21541 times)
How do we measure distances to other stars? (viewed 21536 times)
Will the Moon be invisible in 500 million years? (viewed 21530 times)
Did the speed of light change over the history of the universe? (viewed 21476 times)
What are quasars made of? (viewed 21471 times)
How are galaxies named? (viewed 21390 times)
What do a galaxy's colors mean? Are they its true colors? (viewed 21390 times)
Don't tachyons travel faster than light? (viewed 21317 times)
Has anyone made a map of the Milky Way? (viewed 21275 times)
Was I hit by a meteorite? (viewed 21262 times)
What are the atmospheres of Mars and Pluto like? (viewed 21250 times)
How big a change in the Earth's orbit would be required to destroy all life? (viewed 21217 times)
Have there been other Big Bangs before? (viewed 21189 times)
Are there eclipses on other planets? (viewed 21177 times)
Who came up with the name "black hole"? (viewed 21097 times)
Why do constellations look the same after several years even though all the stars are moving? (viewed 21062 times)
Where do planetary rings come from, and what are they made of? (viewed 20925 times)
Will winter and summer constellations change due to abnormal warmth or cold on Earth? (viewed 20889 times)
What is dark matter? (viewed 20857 times)
What if the Earth rotated twice as fast? (viewed 20823 times)
Can life exist on the recently discovered extrasolar planets? (viewed 20813 times)
Aren't jobs in astronomy scarce? (viewed 20678 times)
Why do most moons orbit their planets at the equator? (viewed 20668 times)
How much time do astronomers spend looking through telescopes? (viewed 20595 times)
How close do you have to come to the Earth to be influenced by its gravity? (viewed 20545 times)
How do I become both an astronaut and an astronomer? (viewed 20529 times)
How do the astronauts communicate in space if sound cannot travel in a vacuum? (viewed 20431 times)
Can we see dead stars with the naked eye? (viewed 20357 times)
How can I tell if the rock I found is a meteorite? (viewed 20265 times)
What would happen if two stars collided? (viewed 20250 times)
How far does a galaxy extend? (viewed 20240 times)
Why don't people walk upside-down on the bottom of the Earth? (viewed 20220 times)
How fast does the Earth go at perihelion and aphelion? (viewed 20123 times)
How many Astronauts have been in space? (viewed 20030 times)
Can superheavy elements (such as Z=116 or 118) be formed in a supernova? Can we observe them? (viewed 20028 times)
Why do the explosions of Type Ia supernovae have a more predictable spectrum than those of regular Type II supernovae? (viewed 20010 times)
Is the gravitational force exerted by the Earth on the Moon equal to the centripetal force acting on the Moon? (viewed 19933 times)
How much can the location of sunset differ from due West? (viewed 19902 times)
How will a change in the speed of light affect the evolution of the Universe? (viewed 19892 times)
How do astronauts communicate with their families from space? (viewed 19868 times)
Can one star orbit another? (viewed 19836 times)
How does Astronomy involve Chemistry? (viewed 19730 times)
Can "tired light theory" explain the observed redshifts of galaxies? (viewed 19710 times)
How can we measure distances to more stars? (viewed 19673 times)
Do we know everything about the Sun? (viewed 19668 times)
Is the Milky Way a collision of two galaxies? (viewed 19662 times)
Did I see the Aurora Borealis as a child? (viewed 19652 times)
What is a Dyson Sphere? (viewed 19651 times)
Is the Sun always up for exactly 12 hours at the equator? (viewed 19643 times)
How do we know what parameters to use when simulating the collision of the Milky Way and Andromeda? (viewed 19637 times)
Is infinite temperature possible? (viewed 19603 times)
Wouldn't the Big Bang theory be considered a hypothesis and not a theory? (viewed 19599 times)
Do you believe in UFOs? (viewed 19595 times)
Will we ever stop having solar eclipses because of the moon's motion away from the Earth? (viewed 19583 times)
Does the Sun have an iron surface? (viewed 19561 times)
How can geometry be different in space? (viewed 19548 times)
Why isn't the sky bright at night if the universe has so many stars? (viewed 19495 times)
Can astronauts produce water in space? (viewed 19437 times)
Why are the compositions of comets and asteroids different? (viewed 19425 times)
Is there such a thing as hyperspace? (viewed 19370 times)
What does the term "visible universe" mean? (viewed 19360 times)
How do asteroids, meteors and comets disappear? (viewed 19284 times)
Why does the SETI project search for radio signals? (viewed 19250 times)
What's so exciting about the new planet around 55 Cancri? (viewed 19248 times)
Who (and when) discovered that the earth's axis is on a 23 degree tilt? (viewed 19148 times)
Will the seasons change due to precession? (viewed 19118 times)
Why does the Sun appear larger on the horizon than overhead? (viewed 19118 times)
What type of energy does a black hole have? (viewed 19071 times)
How do we know that superclusters are the largest structures in the universe? (viewed 19049 times)
How do we determine the age of the universe? (viewed 19047 times)
Why are Saturn's rings flat? (viewed 19036 times)
How do we know the Milky Way is a spiral galaxy? (viewed 19032 times)
Was Stonehenge built to mark solar phenomena? (viewed 19024 times)
Why do photos of space taken from space never show any stars? (viewed 19023 times)
Do you think it's possible to maintain life on other planets? (viewed 19014 times)
Is it true that the Sun burns off a billion tons of gas every 5 seconds? (viewed 18991 times)
Do the magnitudes and colors of stars ever change? (viewed 18968 times)
How do scientists slow light down? (viewed 18966 times)
Can you use an infinite line of reflectors to send light to the edge of the Universe? (viewed 18925 times)
What is the farthest Northern Latitude in which the Magellanic Clouds can be seen? (viewed 18923 times)
What's the object I saw that moved across the sky and then got very bright? (viewed 18912 times)
Do astronomers believe in astrology? (viewed 18912 times)
Why do clocks turn in the opposite direction from the Earth and Moon? (viewed 18908 times)
Why are there active volcanos on Io? (viewed 18900 times)
Are there any dark stars or dark galaxies made of dark matter? (viewed 18897 times)
What happens when an antimatter black hole collides with a matter blackhole? (viewed 18882 times)
How big was the Sun when it first "fired up"? (viewed 18873 times)
When are there 5 Sundays in February? (viewed 18870 times)
When unmanned spacecraft accelerate in space, what causes them to slow down? (viewed 18859 times)
Have gravitational waves been proven to exist? (viewed 18817 times)
What supernova created the Crab nebula? (viewed 18802 times)
Why are most months 30 or 31 days long? (viewed 18784 times)
Is there a project I can do on black holes? (viewed 18771 times)
How can we know that there are other galaxies if we cannot leave ours? (viewed 18743 times)
What process would bring about a quark star? (viewed 18655 times)
Why do astronauts in space need to exercise? (viewed 18620 times)
How are planets detected around other stars? (viewed 18606 times)
Can astronauts play musical instruments in space? (viewed 18568 times)
Why do we study black holes? (viewed 18558 times)
Did a giant impact cause the Dark Ages? (viewed 18486 times)
Why do we assume that the universe is homogeneous? (viewed 18469 times)
Why are there no craters on Earth? Did all the meteorites miss us? (viewed 18421 times)
Which way does the sun travel in the southern hemisphere? (viewed 18339 times)
Is it worthwhile to continue the search for extraterrestrial life? (viewed 18304 times)
How are galaxies and solar systems similar? (viewed 18290 times)
What are "blue stragglers" in globular clusters? (viewed 18250 times)
What are the names of the three stars in Orion's belt? (viewed 18237 times)
Why is Uranus tipped on its side? (viewed 18223 times)
What caused Shoemaker-Levy 9 to split up? (viewed 18194 times)
How close does a supernova need to be to damage the Earth's environment? (viewed 18190 times)
What is a wormhole? (viewed 18187 times)
Can supernovae hinder the formation of life in galaxies? (viewed 18160 times)
Why is the shadow on the Moon the shape it is? (viewed 18129 times)
What is sidereal time? (viewed 18112 times)
How is it proved that the Universe is expanding? (viewed 18104 times)
Is there a list of the sizes of different kinds of stars? (viewed 18087 times)
Why do humans want to go in space? (viewed 18023 times)
How do planets capture satellites? (viewed 18016 times)
How long does it take the Big Dipper to move in the sky? (viewed 18006 times)
What calculations go into predicting eclipses? (viewed 17967 times)
Are there stars outside of galaxies? (viewed 17965 times)
What's the best thing about being an astronomer? (viewed 17954 times)
What happens to the material that has been sucked into a black hole? (viewed 17923 times)
Would extraterrestrial civilizations know that there is life on Earth? (viewed 17906 times)
How can we see galaxies if their stars are so faint? (viewed 17905 times)
Why are stars of different masses? (viewed 17893 times)
Does Cerenkov radiation travel faster than light? (viewed 17858 times)
What is the solar cycle? (viewed 17841 times)
Why is the Hubble Space Telescope in space? (viewed 17706 times)
How do I explain to my children why the Moon has phases? (viewed 17685 times)
Is there sound coming from the Sun? (viewed 17677 times)
What happens when you change the mass of a White Dwarf or Neutron Star? (viewed 17676 times)
What would happen if there was a collision between two white dwarfs? (viewed 17676 times)
Could we send a space mission to a comet? (viewed 17672 times)
Could a different theory of gravity explain the dark matter mystery? (viewed 17669 times)
How do we know that sunspots are associated with the Sun's magnetic field? (viewed 17668 times)
Can two lunar eclipses occur in the same month? (viewed 17654 times)
How do I polar align my telescope? (viewed 17621 times)
What will happen to the Milky Way in the future? (viewed 17619 times)
Why do so many of the world's UFO sightings happen in America? (viewed 17608 times)
How do solar flares affect airline pilots? (viewed 17606 times)
How do we feel heat? (viewed 17603 times)
How can we compare dark matter and dark energy? (viewed 17598 times)
Why doesn't light from distant galaxies reach us instantaneously? (viewed 17577 times)
What kind of eyepieces do I need to look at planets? (viewed 17557 times)
If we invented special suits could we ever go to the sun? (viewed 17545 times)
How different would the night sky have looked in 40,000 B.C.? (viewed 17513 times)
Can you tell time by the Big Dipper? (viewed 17509 times)
Is there any possibility that the Solar System or the Universe is in a black hole? (viewed 17496 times)
Could we be seeing dead stars? (viewed 17467 times)
Can double stars have planets? (viewed 17457 times)
Why is the time between two successive full moons different from the lunar synodic month? (viewed 17445 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 17348 times)
Are the planes of solar systems aligned with the plane of the Galaxy? (viewed 17348 times)
Are the properties of extrasolar planets known? (viewed 17334 times)
As the universe expands, why don't galaxies get stretched out? (viewed 17305 times)
What colors are visible through an amateur telescope? (viewed 17302 times)
How do sunrise and sunset times change with altitude? (viewed 17285 times)
Do similar laws of physics throughout the Universe imply that all life must be like life on Earth? (viewed 17230 times)
How do we know if the universe will keep expanding forever? (viewed 17212 times)
How powerful are quasars? (viewed 17117 times)
Could you escape from a black hole if you were able to go faster than the speed of light? (viewed 17098 times)
Why does one side of Mars look more catastrophic than the other? (viewed 17081 times)
How many comets are currently orbiting our sun? (viewed 17075 times)
How are asteroid compositions and classifications determined? (viewed 17024 times)
What month was it when Odysseus saw Orion in 1000BC? (viewed 17023 times)
Could our position in the universe affect our perceptions of the expansion? (viewed 16940 times)
Do unmanned spacecraft like Voyager travel in straight lines? (viewed 16937 times)
Can I see details on Venus? (viewed 16886 times)
What happened to all the black holes that were around in the early universe? (viewed 16838 times)
What kind of telescope should I use for astrophotography? (viewed 16810 times)
Can I see a quasar? (viewed 16784 times)
How many sunspots can the Sun have at once? (viewed 16779 times)
What kind of instruments are used to detect extrasolar planets? (viewed 16776 times)
Does inflation allow for an infinite number of universes? (viewed 16773 times)
Can any comparison be made between spiral galaxies and hurricanes? (viewed 16755 times)
Can a black hole come back to the visual universe through a "little bang"? (viewed 16745 times)
Where does the kinetic energy of infalling bodies come from? (viewed 16673 times)
What equipment do I need for astrophotography? (viewed 16665 times)
How does the Earth compare in size to the entire universe at the present epoch? (viewed 16655 times)
Can the theory of formation of the solar system explain all the observables? (viewed 16641 times)
Why can we see the sun's image before sunrise and after sunset? (viewed 16580 times)
How long do supernova remnants last? (viewed 16504 times)
How do I become an astronomical artist? (viewed 16480 times)
Why did the Pioneer and Voyager take only 2 years to reach Jupiter, while Galileo and Cassini took more than 5 years? (viewed 16432 times)
Can other terrestrial moons be (or have been) stable? (viewed 16414 times)
Is the universe really like an expanding balloon? (viewed 16412 times)
Does a photon observe other photons moving past it at the speed of light? (viewed 16393 times)
Would the biggest airplanes cause tsunamis if they crashed? (viewed 16380 times)
How can you tell if a crescent moon is preceding or following a new-moon phase? (viewed 16369 times)
Why does the apparent density of galaxies drop off at larger distances? (viewed 16356 times)
Did I really hear a meteor? (viewed 16330 times)
Could there have been multiple Big Bangs at different places in the universe? (viewed 16323 times)
Can I build an instrument to measure the size of the Sun and of the Moon? (viewed 16304 times)
How are supernovae discovered? (viewed 16284 times)
Are there any new craters on the moon? (viewed 16271 times)
Why search for only Earth-like life on other planets? (viewed 16267 times)
How was the starting point for the Julian Date system chosen? (viewed 16258 times)
How is the Cepheid yardstick validated? (viewed 16249 times)
What makes a satellite geosyncronise itself with Earth's orbit? (viewed 16223 times)
Why is the Cosmic Microwave Background not absorbed by interstellar hydrogen? (viewed 16212 times)
On which days can I see the Moon in the evening / morning and why is this so? (viewed 16182 times)
If clocks run slow in a gravitational field, how can we know the true age of the Solar System and Universe? (viewed 16159 times)
Which part of the sky did the famous 'wow' signal originate from? (viewed 16142 times)
Why are there blue shifted galaxies? (viewed 16131 times)
Can gravitational lensing from intervening galaxies cause the observed ripples in the Cosmic Microwave Background? (viewed 16109 times)
Is there a beginning and an end to a galaxy's life? (viewed 16081 times)
Why do some eclipses take longer than others? (viewed 16051 times)
Is it possible for amateurs to do optical interferometry? (viewed 16037 times)
What is meant by "stopping down a telescope"? (viewed 16008 times)
Can you give me advice on buying a telescope? (viewed 15971 times)
Why doesn't NASA build rotating spacecraft to simulate gravity? (viewed 15968 times)
Why was the Platonic year named after Plato? (viewed 15941 times)
Are planetary nebulae the result of supernovae? (viewed 15941 times)
Can you describe a day on the job as an astronomer? (viewed 15860 times)
What is the difference between homogeneity and isotropy? (viewed 15843 times)
Could you tell me about the life cycle of galaxies? (viewed 15836 times)
Would a planet near the galactic center have a brighter night sky? (viewed 15789 times)
Will we discover an 11th planet? What would it be called? (viewed 15786 times)
Why doesn't the hydrogen on Jupiter explode? (viewed 15785 times)
Did time go slower just after the Big Bang? (viewed 15784 times)
How are sunspots formed? (viewed 15695 times)
What would the Big Crunch look like to an observer on Earth? (viewed 15668 times)
Is it possible to build a cheap device to measure declination? (viewed 15657 times)
How hot is each one of the layers of the sun? (viewed 15655 times)
What is a Cepheid variable? (viewed 15624 times)
What class of spiral galaxy is the Milky Way? (viewed 15622 times)
What happened to the girl who named Pluto? (viewed 15607 times)
How can we tell what the interiors of planets are like? (viewed 15595 times)
If comets are boiling away, why are there any left? (viewed 15536 times)
Why don't astronauts sublimate in space? (viewed 15506 times)
What is our galaxy's halo made of, and how was it formed? (viewed 15464 times)
Can the Space Shuttle abort and return to Earth before reaching orbit? (viewed 15459 times)
How do astronomers come up with their facts? (viewed 15420 times)
Why aren't discoveries of extrasolar planets reported on the news? (viewed 15352 times)
Why is pressure broadening greater in low mass stars than in high mass stars? (viewed 15337 times)
Could dark energy come from matter anti-matter pairs forming spontaneously and then annihilating? (viewed 15322 times)
Where can I find information on the moons of other planets? (viewed 15308 times)
What is the SU(3) quark model? (viewed 15256 times)
Will I be able to see the shadow of the Moon streaking towards me in a total solar eclipse? (viewed 15239 times)
Does the Sun have any heavy elements? (viewed 15211 times)
Do galaxies orbit around anything? (viewed 15205 times)
What is the origin of the stellar classification system "OBAFGKM"? (viewed 15204 times)
How are astronomy and poetry linked? (viewed 15178 times)
Does the shuttle worry about space junk? (viewed 15172 times)
Can the acceleration of the Universe be analogous to apparent acceleration in a airplane? (viewed 15171 times)
Can HST see the Oort cloud? (viewed 15143 times)
Why is NASA shutting down the Hubble Space Telescope? (viewed 15053 times)
Can astronomers observe anything when the moon is full? (viewed 15052 times)
What are the boundaries of the constellations? (viewed 15043 times)
How do we know what other planets (and stars, galaxies, etc.) are made of? (viewed 15016 times)
What's new with the Big Bang? (viewed 14931 times)
Why do supernova remnants look like rings rather than spheres? (viewed 14897 times)
Have astronomers observed any phenomena that could be produced by extraterrestrial civilizations? (viewed 14890 times)
How do astronomers measure the radius of a star? (viewed 14887 times)
How could galaxies have gotten so far away in only 15 billion years? (viewed 14869 times)
Can I listen to the SETI@home radio signal? (viewed 14859 times)
Why doesn't SETI concentrate its observations to the nearby stars and the solar systems that we are discovering? (viewed 14848 times)
How can we find galaxies behind the Milky Way? (viewed 14835 times)
Where was the water in the big bang? (viewed 14773 times)
What causes gamma ray bursts? (viewed 14748 times)
Did I find a rock that came from the Moon? (viewed 14720 times)
Why are telescopes kept in cold conditions? (viewed 14712 times)
What is the best time of the year to see eclipses? (viewed 14695 times)
Why are there more maria on the near side of the Moon? (viewed 14680 times)
Could photons be dark matter? (viewed 14650 times)
How can the Sun have such a strong gravitational field if it's made of gasses? (viewed 14644 times)
Do electrons age? (viewed 14642 times)
Is light of different colors affected differently by gravity? (viewed 14574 times)
Why can't relative velocities add up to more than the speed of light? (viewed 14560 times)
How long is twilight on the Moon? (viewed 14548 times)
Do stars' orbits in galaxies obey Kepler's Laws? (viewed 14545 times)
How do bars form in spiral galaxies? (viewed 14431 times)
Do we see the same stars from above and below the equator? (viewed 14410 times)
How fast do particles travel in space? (viewed 14409 times)
What would an "open geometry" for the universe look like? (viewed 14400 times)
Does the temperature of matter increase as it is accelerated to relativistic speeds? (viewed 14335 times)
What do "homogeneity" and "isotropy" mean? (viewed 14273 times)
How long has humanity known that we live in a galaxy similar to others in the Universe? (viewed 14266 times)
What was that eclipse I saw in the sky? (viewed 14252 times)
How do photons from distant objects maintain enough energy to reach us? (viewed 14215 times)
Can we make a movie of the Milky Way galaxy's rotation? (viewed 14139 times)
What causes a particle to decay? (viewed 14133 times)
How much power is contained in a beam of light? (viewed 14113 times)
Why is it important to study meteorites? (viewed 14092 times)
When did people discover that the Sun is a star? (viewed 14070 times)
Will the next generation telescope OWL be able to detect an Earth like extrasolar planet? (viewed 14033 times)
How do we find out about the star formation histories of galaxies? (viewed 14032 times)
What is the best way to see the Milky Way? (viewed 13985 times)
Will the diameter of a cluster of galaxies change with redshift? (viewed 13951 times)
Are the asteroids the remains of a planet which broke apart? (viewed 13933 times)
Is there oxygen in the atmospheres of other planets? (viewed 13932 times)
Why are accretion disks flat? (viewed 13897 times)
What are "curled" dimensions? (viewed 13860 times)
What kinds of star clusters are there? (viewed 13850 times)
How do you classify galaxies? (viewed 13840 times)
Did the Sumerians measure precession? (viewed 13812 times)
Can you tell me the characteristics of W, R, N and S type stars? (viewed 13777 times)
How can I contribute to science as an amateur astronomer? (viewed 13747 times)
Why are telescopes located in remote places? (viewed 13721 times)
Will the Leonid meteor shower go away? (viewed 13654 times)
How can we understand the meaning of large numbers like "a million million?" (viewed 13600 times)
Could we send a manned mission to the outer planets? (viewed 13502 times)
Wouldn't the vast distances of space distort SETI signals into unintelligeble forms? (viewed 13496 times)
Why can we have solar eclipses? (viewed 13489 times)
What kind of interference must astronomers contend with when observing? (viewed 13455 times)
Do we have to worry about relativity when studying galactic objects? (viewed 13454 times)
How does interferometry work? (viewed 13449 times)
What is the farthest in space that we have gone? (viewed 13365 times)
What do stellar classifications mean? (viewed 13301 times)
How are photons created and destroyed? (viewed 13240 times)
How do distant galaxies differ from those nearby? (viewed 13239 times)
How do astronomers observe the Sun's interior? (viewed 13234 times)
How does melting a material reset its radioactive clock? (viewed 13109 times)
Will astronauts ever be able to go ice-skating on Europa? (viewed 13067 times)
Why do spacecraft need heat shields coming back to Earth but not leaving? (viewed 13059 times)
How can I watch the Perseid meteor shower? (viewed 12989 times)
How can I nominate myself for a Nobel Prize in Physics? (viewed 12957 times)
How are astronauts trained for weightlessness? (viewed 12956 times)
How did Mars get so dusty? (viewed 12863 times)
What is the three-body problem? (viewed 12851 times)
Is cosmic expansion happening on microscopic scales? (viewed 12821 times)
Do asteroids hit the sun? (viewed 12767 times)
How can you tell the difference between single and multiple extrasolar planets? (viewed 12750 times)
Where can I see Newton's original reflecting telescope? (viewed 12715 times)
Do we really observe the edges of galaxies at different epochs? (viewed 12699 times)
How does a star take mass from another star? (viewed 12660 times)
How can I find out if the new moon has been sighted? (viewed 12494 times)
How can water be chemically trapped in rocks? (viewed 12478 times)
Why is the WMAP picture of the CMB an ellipse? (viewed 12470 times)
If the universe is "bounded" today, could it one day become "unbounded"? (viewed 12320 times)
Do binary or triple star systems form together? (viewed 12284 times)
If the Universe was infinitely dense at the Big Bang, why didn't time stand still? (viewed 12074 times)
How does libration allow us to see more than 50% of the Moon? (viewed 12067 times)
Why will fusion wait until hydrogen is gone before starting to fuse heavier atoms? (viewed 12052 times)
What color would Mars be if you were standing on it? (viewed 12032 times)
Is the Local Group expanding along with the entire Universe? (viewed 12012 times)
Is light blueshifted when it is gravitationally lensed? (viewed 11995 times)
What percent of the time can astronomers observe without interference from the Moon? (viewed 11972 times)
What is "nothing", from a scientific point of view? (viewed 11880 times)
How do unmanned space probes avoid running into things? (viewed 11834 times)
How can the universe be "flat"? We're 3D! (viewed 11798 times)
Do asteroids ever do anything good in the Solar System? (viewed 11732 times)
No matter how fast the universe is expanding, shouldn't gravity eventually make it recollapse? (viewed 11725 times)
What kinds of cancer research have been done in space? (viewed 11627 times)
Why aren't accretion disks around giant stars as hot as accretion disks around black holes? (viewed 11464 times)
What is Hot Dark Matter theory? (viewed 11421 times)
How can observations of the distant universe prove that the expansion is accelerating *now*? (viewed 11337 times)
What would happen if you went back in time and killed your grandmother? (viewed 11301 times)
Why is it easier to see a star if you look slightly to the side? (viewed 11179 times)
Could matter-anti-matter repulsion power the expansion of the universe? (viewed 11140 times)
What do meteorites tell us about life on other planets? (viewed 10817 times)
Why don't all neutron stars become pulsars? (viewed 10811 times)
Why is it called astronomy when all the other sciences end in -ology? (viewed 10783 times)
Could neutrinos be dark matter? (viewed 10783 times)
What is the photoelectric effect? Why can't multiple low-frequency photons free an electron? (viewed 10667 times)
What are collections of galaxies called? (viewed 10648 times)
Can a human give birth in space? (viewed 10636 times)
Are there any 'lonely galaxies'? (viewed 10576 times)
How are planets affected by the Hot Ionised Medium? (viewed 10450 times)
What was different on Mars in the past to allow liquid water to be present? (viewed 10259 times)
What is the relationship between the width of a star trail on a photo and the star's intensity? (viewed 10234 times)
How can we discern different galaxies/clusters along the same line of sight? (viewed 10135 times)
During close approaches, can Mars appear in our sky as large as the Moon? (viewed 10114 times)
Why doesn't the ammonia and methane in Jupiter's atmosphere sink into the core? (viewed 10037 times)
Do constellations looks the same from space? (viewed 10010 times)
Why was Mir burnt up in the atmosphere? (viewed 9929 times)
What are the largest radio wavelengths observed from radio sources in the sky? (viewed 9610 times)
Do the Earth's magnetic poles ever change places? (viewed 9590 times)
How does the color index of a star relate to its actual color? (viewed 9487 times)
Does lunar gardening really work? (viewed 9351 times)
Is it a coincidence that we can have total solar eclipses? Are there other planets which also have them? (viewed 9337 times)
How big is the Hubble Ultra Deep Field image? (viewed 9265 times)
Why is the sky blue and not blue & purple? (viewed 9046 times)
Could the Universe's dark matter be made up of black holes? (viewed 8851 times)
How do we detect incoming meteorites? (viewed 8791 times)
Is the green flash real? (viewed 8403 times)
If nothing can escape a black hole, why do some black holes have jets? (viewed 8098 times)
If the sun went out and our atmosphere froze solid, what color would it be? (viewed 7877 times)
Does weightlessness affect hunger? (viewed 7791 times)
How do we know the density of some extrasolar planets? (viewed 7368 times)
Can the sun rise from the west on Mars? (viewed 6506 times)
What would happen if a human were exposed to space without wearing a spacesuit? (viewed 6493 times)
Can we harvest H & O from space to make water? (viewed 6440 times)
Are black holes spherical? (viewed 6113 times)
What is between the Oort cloud and the closest star? (viewed 5954 times)
Has anyone ever seen a star "turn on"? (viewed 5657 times)
Why don't skydivers burn up like meteors? (viewed 5105 times)
When measuring the expansion of the universe, do astronomers consider that they're seeing how galaxies moved long ago, not today? (viewed 5070 times)
Does the Milky Way spin counter-clockwise? If so, do all spiral galaxies spin in this direction and why? (viewed 4984 times)
Did the Moon or planets form in a manner similar to that of Earth? (viewed 4887 times)
When will Hale-Bopp return? (viewed 4826 times)
What would happen if a nuclear-powered shuttle exploded? (viewed 4824 times)
Can we prove that the Moon isn't hollow? (viewed 4756 times)
Could a planetary system survive if its star merged with another, or if its star went supernova? (viewed 4636 times)
Why are craters round? (viewed 4405 times)
Is it sensible to consider terraforming Mars? (viewed 4141 times)
Can planets collide with one another? (viewed 4115 times)
Do planets radiate noise? (viewed 4108 times)
How do supernovae show us that the Universe's expansion is accelerating? (viewed 4078 times)
If there are infinity universes, will every thing that is possible happen? (viewed 3620 times)
Are there solar tides? (viewed 3591 times)
When will humans travel to Mars and revisit the Moon? (viewed 3329 times)
Will the Pioneer and Voyager probes ever leave the Milky Way? (viewed 2643 times)
Where is the Spitzer Space Telescope? (viewed 2621 times)
If I were traveling through space, could I see distant galaxies with my own eyes? (viewed 2428 times)
Is Earth-moon tidal friction causing global warming? (viewed 2398 times)
Does the particles involved in a star's final core collapse travel faster than the speed of light? (viewed 2155 times)
Why does Titan, in spite of being smaller than Mars, have an atmosphere more dense than Earth's? (viewed 1961 times)
Do more meteorites fall at low latitudes? (viewed 1945 times)
Is the moon spherical? (viewed 1907 times)
What are the possible ends of the universe? (viewed 1753 times)
The naming of Mars (viewed 1704 times)
When is the best time to observe zodiacal light? (viewed 1632 times)
Is the reddish dust of Mars biogenic? (viewed 1482 times)
Why does Mars have a dusty atmosphere? (viewed 1431 times)
How has light from 13 billion years ago not passed us by? (viewed 1403 times)
Is dark energy affected by black holes? (viewed 1328 times)
What color are meteors? (viewed 1023 times)
Where is everybody? (viewed 447 times)

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