All previously answered questions (in order of times viewed)

What color is each planet? (viewed 257619 times)
What's going to happen on December 21st 2012? (viewed 251394 times)
Is the Moon moving away from the Earth? When was this discovered? (viewed 237298 times)
How do I build a model rocket? (viewed 205661 times)
How far is each planet from Earth? (viewed 199871 times)
What is the life cycle of a star? (viewed 178052 times)
How do you measure the distance between Earth and the Sun? (viewed 162905 times)
What is the largest star? (viewed 159987 times)
How many stars are there in our Galaxy (Milky Way)? (viewed 152600 times)
What is a white hole? (viewed 145979 times)
What color is Venus? (viewed 135819 times)
Why do the planets orbit the sun? (viewed 119192 times)
Which planets have rings? (viewed 112166 times)
At what speed does the earth move around the sun? (viewed 109937 times)
Is the distance from the Earth to the Sun changing? (viewed 102942 times)
What are the names of the earth, moon, sun, and solar system? (viewed 102322 times)
What makes the Earth rotate? (viewed 97648 times)
Is Pluto a planet? (viewed 91013 times)
Why do stars twinkle? (viewed 89183 times)
What do astronauts eat in space? Can they grow food? (viewed 88985 times)
What is the universe expanding into? (viewed 83641 times)
Does the Moon rotate? Are there other moons that always keep one face toward their planet? (viewed 80676 times)
Will the sun go supernova in six years and destroy Earth (as seen on Yahoo)? (viewed 79223 times)
How long does it take for the Sun's light to reach us? (viewed 77691 times)
Why do planets rotate? (viewed 77490 times)
Where did the name 'Earth' come from? (viewed 75950 times)
What are shooting stars? (viewed 74248 times)
Who named the planets and who decides what to name them? (viewed 73833 times)
Why are there both high and low tides? (viewed 70440 times)
What is the largest galaxy? (viewed 69677 times)
How many known galaxies are there? (viewed 67577 times)
How critical is the Earth-Sun distance in maintaining our average temperatures on Earth? (viewed 62510 times)
How do we know the age of the Universe and the Earth? (viewed 59679 times)
What was there before the Big Bang and what is there outside of our universe? (viewed 59670 times)
How does the location of sunrise and sunset change throughout the year? (viewed 58681 times)
Is the Sun expanding? Will it ever explode? (viewed 56163 times)
Can you hear sounds in space? (viewed 55582 times)
What would happen if an impact caused Earth to stop rotating? (viewed 53959 times)
Will the magnetic field of the Earth reverse its direction in the future? Will this cause problems? (viewed 52941 times)
Have astronomers discovered Earth's second moon? (viewed 52781 times)
Did astronauts really go to the Moon, or is it a hoax? (viewed 52763 times)
When is the next comet due to arrive? (viewed 52642 times)
Are there telescopes that can see the flag and lunar rover on the Moon? (viewed 52432 times)
What kind of rock is the moon made of? (viewed 51898 times)
What is the hottest time of day? (viewed 51579 times)
How many Earths fit into the Sun? (viewed 51318 times)
What is apparent magnitude? (viewed 50769 times)
What will happen to life on Earth when the Sun becomes a red giant? (viewed 50621 times)
What is the observational difference between a star and a planet? (viewed 49433 times)
How does the position of Moonrise and Moonset change? (viewed 48272 times)
How do stars move in the Galaxy? (viewed 48044 times)
What would happen if we did not have a Moon? (viewed 47423 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 47018 times)
Does the Sun orbit the Earth as well as the Earth orbiting the Sun? (viewed 46930 times)
Can I buy a star? (viewed 46820 times)
What is at the end of the Universe? (viewed 45776 times)
What is the physical difference between a star and a planet? (viewed 45235 times)
Who has landed on the moon? (viewed 44284 times)
How long does a solar eclipse last? (viewed 43845 times)
Is the universe expanding faster than the speed of light? (viewed 43723 times)
Why is a day divided into 24 hours? (viewed 43086 times)
Why aren't there any green stars? (viewed 42958 times)
Can we feel the Earth spin? (viewed 42801 times)
How do astronauts take baths and use restrooms in space? (viewed 41964 times)
Does the Sun have a scientific name? (viewed 41876 times)
What happens when galaxies collide? (viewed 41642 times)
How do you calculate the lifetime of the Sun? (viewed 41575 times)
What direction do planets rotate? (viewed 41023 times)
Does the Sun rotate? (viewed 40970 times)
Does the Sun move around the Milky Way? (viewed 40910 times)
What causes seasons? (viewed 40904 times)
What is that ring (or rainbow) around the moon? (viewed 40733 times)
When will Halley's Comet return? (viewed 40412 times)
Is there a proof that Earth moves? (viewed 40385 times)
Why are the Moon and Sun sometimes orange or red? (viewed 39846 times)
Why do planets have elliptical orbits? (viewed 39547 times)
Why are stars and planets round? (viewed 39155 times)
What is a singularity? (viewed 39044 times)
How can I find the star I have "bought"? (viewed 38975 times)
Where does the name "Milky Way" come from? (viewed 38907 times)
How do rockets work? (viewed 38786 times)
Can artificial gravity be created in space? (viewed 38491 times)
What are the "dog days of summer"? (viewed 38416 times)
How much money do astronomers make? (viewed 38164 times)
What is the mass of the Universe? (viewed 37949 times)
What are the advantages and disadvantages of using a telescope in space? (viewed 37924 times)
Since Earth is spinning, why do we land in the same place when we jump or fall? (viewed 37818 times)
How does the Sun compare to other stars? (viewed 37462 times)
How are black holes made? Could one be made close to us? (viewed 37367 times)
Why doesn't the earliest sunset occur on the shortest day of the year? (viewed 37361 times)
What is a nova? (viewed 37249 times)
How many constellations are there? (viewed 37172 times)
What would happen if an asteroid 10 kilometers across hit the Earth? (viewed 37075 times)
What is the largest structure in the universe? (viewed 36915 times)
Do stars move in the sky? (viewed 36754 times)
What elements make up the Sun? (viewed 36516 times)
How can we see the Milky Way if we are inside it? (viewed 36426 times)
Is time travel possible? (viewed 36334 times)
Why do airplanes take longer to fly West than East? (viewed 36217 times)
Why does the Earth have only one moon? (viewed 36044 times)
Where did the Universe come from? (viewed 36016 times)
How are light and heavy elements formed? (viewed 35996 times)
Why doesn't the length of each day change much around the solstices? (viewed 35623 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 35050 times)
What are RA and DEC? (viewed 34677 times)
When can I see the Moon through the hole in the Pantheon? (viewed 34660 times)
Who first measured the speed of light? (viewed 34631 times)
Is it possible to measure the temperature of the Sun? (viewed 34566 times)
What would happen if the gravity on Earth was suddenly turned off? (viewed 34548 times)
Which planet is most similar to Earth? (viewed 34463 times)
What's the best college for astronomy? (viewed 34121 times)
Does your weight change between the poles and the equator? (viewed 33852 times)
What would you see from inside a black hole? (viewed 33704 times)
What is the size of the Solar System? (viewed 33670 times)
What are some astronomy science fair projects? (viewed 33603 times)
Will the Sun become a black hole one day? (viewed 33591 times)
Traveling at light speed, how long would it take to get to the nearest galaxy? (viewed 33591 times)
What happens to a substance if its speed is more than the speed of light? (viewed 33316 times)
Where are stars born? (viewed 33316 times)
How much money is spent on space exploration? (viewed 33239 times)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (viewed 33086 times)
How many stars are born and die each day? (viewed 32995 times)
Why is the Universe flat and not spherical? (viewed 32863 times)
What is the density of a black hole? (viewed 32595 times)
What would happen if a supermassive black hole came close to the Earth? (viewed 32585 times)
Do most astronomers believe in God based on the available scientific evidence? (viewed 32569 times)
Could there be life in the galaxies nearest to the Milky Way? (viewed 32509 times)
How do we know the mass of the Earth and the Moon? (viewed 32449 times)
How often does the Sun pass through a spiral arm in the Milky Way? (viewed 32404 times)
How did the stars get named? (viewed 32172 times)
How do astronomers use math in their jobs? (viewed 32119 times)
Why isn't the summer solstice the hottest day of the year? (viewed 32040 times)
How can I find the distance to the Sun on any given day? (viewed 32019 times)
How does the parachute in a model rocket work? (viewed 31909 times)
Do black holes die? If so how? (viewed 31693 times)
If the universe is infinite does that mean there is an infinite number of "me"s? (viewed 31540 times)
How are galaxies formed? (viewed 31124 times)
When the Sun converts mass to energy, do the orbits of the planets change? (viewed 31036 times)
Does the Moon rotate? (viewed 30742 times)
What makes the wind? (viewed 30687 times)
Are aliens or UFOs real? (viewed 30650 times)
Was the Sun made in a supernova? (viewed 30630 times)
Are there any asteroids on a collision course with Earth? (viewed 30484 times)
When was the last time all 9 planets were aligned? (viewed 30468 times)
What can I use for fuel in my homemade rocket? (viewed 30337 times)
What is the shape of the universe? (viewed 30227 times)
Are names given to black holes? (viewed 30069 times)
What are black holes made of? (viewed 29918 times)
What are constellations used for? (viewed 29915 times)
What kinds of jobs do astronomers do? (viewed 29900 times)
What is the biggest crater recorded on Earth? (viewed 29830 times)
Where does the name "Moon" come from? (viewed 29775 times)
How long would it take the Earth to fall into the Sun? (viewed 29769 times)
Why do planets not twinkle? (viewed 29714 times)
How do astronomers measure the brightness of stars? (viewed 29648 times)
How can the Universe expand faster than the speed of light during inflation? (viewed 29505 times)
Why do different stars appear with seasons? (viewed 29339 times)
If light has no mass, then what draws it into a black hole? (viewed 29193 times)
What are Altitude and Azimuth? (viewed 29182 times)
Why is it difficult to understand the expansion of the universe? (viewed 29166 times)
Does gravity vary across the surface of the Earth? (viewed 29142 times)
How did asteroids form and what is the difference between an asteroid and a comet? (viewed 29140 times)
Who discovered each planet? (viewed 29098 times)
Considering the motion of the Earth, the solar system, and the galaxy, how fast am I moving while lying in bed asleep? (viewed 29024 times)
Where, in relation to the entire universe, is the Milky Way located? (viewed 28958 times)
How can I measure the distance of a star? (viewed 28667 times)
How does the Moon stay "suspended" in the air? (viewed 28616 times)
How big is the universe? (viewed 28539 times)
How do we measure the size of the Moon and of the Sun? (viewed 28454 times)
How do astronauts use math in their jobs? (viewed 28418 times)
How do you calculate the azimuth and altitude of an object? (viewed 28404 times)
What is time dilation? (viewed 28357 times)
What would happen to us if the sun went out for an hour? (viewed 28223 times)
What's the difference between astronomy and astrology? (viewed 28204 times)
What do astronauts do all day in the International Space Station? (viewed 28103 times)
Why is the Moon so bright? (viewed 28049 times)
What kind of schooling is necessary to become an astronomer? (viewed 27905 times)
Where is the nearest black hole? (viewed 27800 times)
Why hasn't NASA gone back to the moon? (viewed 27757 times)
Why does the Moon look big on the horizon? (viewed 27675 times)
What happens when two black holes get too close? (viewed 27662 times)
How do you measure a planet's mass? (viewed 27524 times)
Where is the supernova remnant that led to our solar system? (viewed 27397 times)
What do I need to do to become an astronomer? (viewed 27332 times)
Can you fire a gun on the Moon? (viewed 27307 times)
What is the size of a black hole? (viewed 27247 times)
What would happen if Earth had more than one moon? (viewed 27022 times)
Do dead stars still shine? (viewed 27017 times)
Is the speed of light constant? (viewed 26872 times)
How is astronomy impacted by trigonometry? (viewed 26871 times)
What other careers involve Astronomy besides Astronomer? (viewed 26616 times)
Why does Barnard 68 appear dark? (viewed 26563 times)
What is the origin of spiral structure in galaxies? (viewed 26454 times)
Can I buy land on the Moon? (viewed 26401 times)
Why does the Earth tilt back and forward once a year? (viewed 26397 times)
Why does the Earth only see one side of the Moon? (viewed 26393 times)
How do you measure the mass of a star? (viewed 26356 times)
Can you see satellites? (viewed 26352 times)
How do gravitons escape black holes to tell the universe about their gravity? (viewed 25996 times)
What are some of the effects of solar flares on Earth? (viewed 25873 times)
Does Mt. Everest cast a shadow on the moon? (viewed 25852 times)
Why do pictures of distant galaxies have higher resolution than those of nearby planets? (viewed 25747 times)
Why can't you see stars during the day? (viewed 25700 times)
Where did all the water in the universe come from? (viewed 25637 times)
How fast is the Universe expanding? (viewed 25527 times)
How can two moons of Saturn share the same orbit? (viewed 25509 times)
Will we get sucked into the black hole at the center of the Milky Way? (viewed 25466 times)
Can we look back far enough in time to see the Big Bang? (viewed 25428 times)
How do rockets move in space? (viewed 25425 times)
What makes up most of the Universe? (viewed 25424 times)
Would your weight change as you go underground? (viewed 25415 times)
Why do the size and brightness of the full moon change? (viewed 25411 times)
Can I calculate the size of the Universe by converting light years to kilometres? (viewed 25312 times)
What is the most distant known galaxy? (viewed 25272 times)
How do galaxies collide in an expanding universe? (viewed 25186 times)
What would happen if the Moon fell out of its orbit around Earth? (viewed 24979 times)
Why is the moon in a different place every night? (viewed 24877 times)
How are elements heavier than iron formed? (viewed 24860 times)
What was that really big falling star that I saw? (viewed 24780 times)
Why do all the planets orbit in the same plane? (viewed 24756 times)
Why do we see stars? (viewed 24720 times)
Where did the matter in the universe come from? (viewed 24715 times)
What is a star's "spectrum"? (viewed 24693 times)
What would happen to the Earth if an asteroid hit the Moon? (viewed 24587 times)
What can we learn from the color of a star? (viewed 24472 times)
Why doesn't dark matter fall into a black hole? (viewed 24393 times)
Why is sea water salty, and not lake water? (viewed 24362 times)
How are black holes discovered? (viewed 24202 times)
How can I calculate the position or path of the Sun for a given time and location? (viewed 24128 times)
Why do stars change colour when they twinkle? (viewed 24123 times)
What are the different kinds of astronomers? (viewed 24122 times)
What is the difference between a "star" and a "sun"? (viewed 24090 times)
How much longer will the Earth last? (viewed 24063 times)
Is the Great Wall the largest galaxy cluster? (viewed 24059 times)
What's the biggest meteorite? (viewed 24040 times)
What is the speed of gravity? (viewed 24000 times)
Do the Sun's or Earth's magnetic field reverse? (viewed 23914 times)
How can a star burn with no oxygen? (viewed 23910 times)
What is a graviton? (viewed 23850 times)
Why can't we see Venus at night when it is an inner planet? (viewed 23809 times)
Why is looking out the same as looking back in time? (viewed 23760 times)
Can any galaxies be seen with the naked eye? (viewed 23745 times)
How does light pollution affect astronomers? (viewed 23665 times)
Could someone travel the universe in his or her own lifetime? (viewed 23664 times)
Can terrestrial planets have rings? (viewed 23602 times)
How can I find my age on another planet? (viewed 23483 times)
How many stars can I see? (viewed 23421 times)
Why are there stars? (viewed 23373 times)
Why is twilight short near the equator? (viewed 23356 times)
Did life originate on Earth, or did it come from somewhere else? (viewed 23288 times)
Why does the location of sunrise change? (viewed 23272 times)
How do I tell which planet is which? (viewed 23261 times)
What is the typical size of a visible shooting star? (viewed 23227 times)
Why have star signs shifted by one constellation? (viewed 23148 times)
Is time travel possible using merging black holes? (viewed 23103 times)
Is it possible to count the stars? (viewed 23089 times)
Is the Earth slowly getting larger? (viewed 23077 times)
How can we estimate the number of Earth-like planets in the Galaxy? (viewed 23060 times)
What happens to a bullet fired on the moon? (viewed 22962 times)
Is the Moon hollow? (viewed 22907 times)
Do supermassive black holes cause galaxy rotation? (viewed 22883 times)
Does quantum entanglement imply faster than light communication? (viewed 22879 times)
How many meteorites hit Earth each year? (viewed 22869 times)
What is Earthrise over the Moon? (viewed 22855 times)
Which constellation does our Sun belong to? (viewed 22787 times)
How long has there been water on Earth? (viewed 22727 times)
Has there been an experiment that measured speed faster than the speed of light in vacuum? (viewed 22707 times)
Is there a "South Star"? (viewed 22682 times)
What is the evidence supporting the nebula theory of Solar System formation? (viewed 22677 times)
Why don't astronomers use everyday units to measure distances (what is an AU or a pc)? (viewed 22671 times)
Does evolution contradict the second law of thermodynamics? (viewed 22578 times)
What is the approximate GPA needed in High School in Math and Science to be an astronomer? (viewed 22562 times)
How does night and day work? (viewed 22544 times)
Is there really a 10th planet? (viewed 22515 times)
What's the difference between astronomy and astrophysics? (viewed 22503 times)
Is Andromeda part of the Milky Way? Where can I find them in the sky? (viewed 22470 times)
How long does the supernova stage of a star last? (viewed 22445 times)
How can I calculate distances between stars? (viewed 22431 times)
Does the Coriolis force determine which way my toilet drains? Does it affect black holes? (viewed 22293 times)
Why is our solar system so different from all the others we've found? (viewed 22191 times)
Why does the Sun's apparent path through the sky change throughout the year? (viewed 22133 times)
How would the weather on Earth be different if it were a cube? (viewed 22108 times)
Which hemisphere has the best view of the Milky Way? (viewed 22026 times)
Is the Earth at the centre of the Universe? (viewed 21948 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 21921 times)
When we look back to the Big Bang, why don't we see the universe as a tiny speck of matter? (viewed 21848 times)
Could the Universe have expanded faster than the speed of light at the Big Bang? (viewed 21825 times)
Is it possible to see the full Moon and the Sun simultaneously in high northern latitudes when the Sun doesn't set? (viewed 21824 times)
Are meteorites hot or cold when they hit Earth? (viewed 21816 times)
Can moons have moons? (viewed 21802 times)
What is the pattern to the distances between each planet and the sun? (viewed 21778 times)
What are the closest and/or brightest stars? (viewed 21753 times)
What is a dimension? (viewed 21693 times)
Can you see the future as you fall into a black hole? (viewed 21673 times)
Are all stars the same? (viewed 21554 times)
Is there any limitation to what a black hole can "suck" in? (viewed 21544 times)
How long would it take for a mini-black hole to eat the Earth? (viewed 21520 times)
Why doesn't gravity change the speed of light? (viewed 21516 times)
Which American colleges teach astronomy? (viewed 21409 times)
Can I communicate faster than light? (viewed 21391 times)
How many moles of stars are in the known universe? (viewed 21370 times)
Are time machines possible? (viewed 21360 times)
What skills do astronomers need? (viewed 21346 times)
Does the Mediterranean sea have tides? (viewed 21283 times)
How close was the Moon to the Earth when it formed? (viewed 21262 times)
How does the brightness of a star depend on its distance from us? (viewed 21253 times)
If a white dwarf is a "dead" star, why is it so hot? (viewed 21090 times)
Can a person go into a black hole and come out alive? (viewed 21007 times)
What is happening just around the black hole in the center of the Milky Way? (viewed 20999 times)
Can we colonize other planets? (viewed 20989 times)
Why do we not have eclipses every month? (viewed 20986 times)
How is the time of sunrise calculated? (viewed 20968 times)
How do we define distance in an expanding universe? (viewed 20944 times)
What is the difference between the "Doppler" redshift and the "gravitational" or "cosmological" redshift? (viewed 20901 times)
What is the significance of the second focus of elliptical orbits of planets in our Solar System? (viewed 20720 times)
Can a lunar and a solar eclipse happen in the same month? When will this happen next? (viewed 20709 times)
How dangerous are the asteroids? (viewed 20635 times)
How is it that we see farther out in space (farther back in time) than in the past? (viewed 20628 times)
What's that dark spot on the Sun? (viewed 20585 times)
How are galaxy distances inferred from their recessional velocities? (viewed 20551 times)
Could an astronaut or satellite fall into a black hole that we didn't know about? (viewed 20546 times)
How do I make a scale model of the Solar System? (viewed 20535 times)
If the universe is 15 billion years old, how can it be larger than 15 billion light years across? (viewed 20532 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 20532 times)
How do we know that nuclear fusion is still going on in the Sun? (viewed 20475 times)
How will the two black holes that are going to collide affect Earth? (viewed 20455 times)
What would happen if you took off your helmet in space? (viewed 20439 times)
What happens to spacetime inside a black hole? (viewed 20425 times)
Are Earth and the Moon "twin planets"? (viewed 20402 times)
What are the requirements for being a planet? (viewed 20357 times)
How are galaxies named? (viewed 20324 times)
What companies or businesses can astronomers work for? (viewed 20309 times)
What are the facts about the Star of Bethlehem? (viewed 20240 times)
What are the atmospheres of Mars and Pluto like? (viewed 20222 times)
How do we measure distances to other stars? (viewed 20189 times)
How long could life on Earth survive if the Sun stopped shining? (viewed 20177 times)
Can we find the place where the Big Bang happened? (viewed 20118 times)
What's the difference between dark matter and dark energy? (viewed 20079 times)
Did the speed of light change over the history of the universe? (viewed 19995 times)
How does astronomy benefit humankind? (viewed 19954 times)
Why do people draw stars with five points? (viewed 19950 times)
Was I hit by a meteorite? (viewed 19942 times)
Have there been other Big Bangs before? (viewed 19912 times)
Has anyone made a map of the Milky Way? (viewed 19875 times)
What are quasars made of? (viewed 19845 times)
Is there a simple formula to calculate solar eclipse timings from any position on Earth? (viewed 19844 times)
Don't tachyons travel faster than light? (viewed 19778 times)
How big a change in the Earth's orbit would be required to destroy all life? (viewed 19745 times)
What do a galaxy's colors mean? Are they its true colors? (viewed 19686 times)
Will winter and summer constellations change due to abnormal warmth or cold on Earth? (viewed 19667 times)
Can life exist on the recently discovered extrasolar planets? (viewed 19640 times)
What is the difference between nutation and precession of the Earth? (viewed 19548 times)
Who came up with the name "black hole"? (viewed 19541 times)
Why do constellations look the same after several years even though all the stars are moving? (viewed 19531 times)
Why do most moons orbit their planets at the equator? (viewed 19529 times)
The Moon slows the Earth's rotation, but how fast was it spinning billions of years ago? (viewed 19503 times)
How much time do astronomers spend looking through telescopes? (viewed 19457 times)
Aren't jobs in astronomy scarce? (viewed 19446 times)
How close do you have to come to the Earth to be influenced by its gravity? (viewed 19440 times)
Are Kuiper Belt Objects asteroids? Are large Kuiper Belt Objects planets? (viewed 19417 times)
If gravity is a "curvature of space" rather than a force, why do a ball and bullet follow different paths? (viewed 19373 times)
Will the Moon be invisible in 500 million years? (viewed 19316 times)
Are there eclipses on other planets? (viewed 19298 times)
What is dark matter? (viewed 19146 times)
How do we weigh objects in space? (viewed 19145 times)
How far does a galaxy extend? (viewed 19138 times)
Where do planetary rings come from, and what are they made of? (viewed 18932 times)
Why do the explosions of Type Ia supernovae have a more predictable spectrum than those of regular Type II supernovae? (viewed 18876 times)
How do I become both an astronaut and an astronomer? (viewed 18874 times)
Is the gravitational force exerted by the Earth on the Moon equal to the centripetal force acting on the Moon? (viewed 18871 times)
Can we see dead stars with the naked eye? (viewed 18830 times)
What is a Dyson Sphere? (viewed 18792 times)
Can one star orbit another? (viewed 18780 times)
How can I tell if the rock I found is a meteorite? (viewed 18747 times)
Why don't people walk upside-down on the bottom of the Earth? (viewed 18700 times)
How will a change in the speed of light affect the evolution of the Universe? (viewed 18693 times)
What would happen if two stars collided? (viewed 18683 times)
Wouldn't the Big Bang theory be considered a hypothesis and not a theory? (viewed 18666 times)
Can superheavy elements (such as Z=116 or 118) be formed in a supernova? Can we observe them? (viewed 18664 times)
How do we know what parameters to use when simulating the collision of the Milky Way and Andromeda? (viewed 18663 times)
Can "tired light theory" explain the observed redshifts of galaxies? (viewed 18586 times)
Do we know everything about the Sun? (viewed 18572 times)
How fast does the Earth go at perihelion and aphelion? (viewed 18539 times)
What if the Earth rotated twice as fast? (viewed 18521 times)
Do you believe in UFOs? (viewed 18469 times)
Is the Milky Way a collision of two galaxies? (viewed 18450 times)
How can we measure distances to more stars? (viewed 18425 times)
Did I see the Aurora Borealis as a child? (viewed 18416 times)
How do the astronauts communicate in space if sound cannot travel in a vacuum? (viewed 18389 times)
Why are the compositions of comets and asteroids different? (viewed 18337 times)
How do astronauts communicate with their families from space? (viewed 18311 times)
Is the Sun always up for exactly 12 hours at the equator? (viewed 18288 times)
What's so exciting about the new planet around 55 Cancri? (viewed 18286 times)
Why do photos of space taken from space never show any stars? (viewed 18281 times)
Is there such a thing as hyperspace? (viewed 18237 times)
Is infinite temperature possible? (viewed 18211 times)
Can astronauts produce water in space? (viewed 18136 times)
How much can the location of sunset differ from due West? (viewed 18124 times)
How do asteroids, meteors and comets disappear? (viewed 18122 times)
How do we know that superclusters are the largest structures in the universe? (viewed 18122 times)
Do you think it's possible to maintain life on other planets? (viewed 18107 times)
How can geometry be different in space? (viewed 18067 times)
Why does the SETI project search for radio signals? (viewed 18056 times)
Why are there active volcanos on Io? (viewed 18054 times)
Can you use an infinite line of reflectors to send light to the edge of the Universe? (viewed 18044 times)
Will the seasons change due to precession? (viewed 18022 times)
What is the farthest Northern Latitude in which the Magellanic Clouds can be seen? (viewed 17989 times)
Do the magnitudes and colors of stars ever change? (viewed 17971 times)
How big was the Sun when it first "fired up"? (viewed 17960 times)
What type of energy does a black hole have? (viewed 17944 times)
Why isn't the sky bright at night if the universe has so many stars? (viewed 17915 times)
What does the term "visible universe" mean? (viewed 17911 times)
Does the Sun have an iron surface? (viewed 17895 times)
When unmanned spacecraft accelerate in space, what causes them to slow down? (viewed 17873 times)
What supernova created the Crab nebula? (viewed 17853 times)
When are there 5 Sundays in February? (viewed 17832 times)
Have gravitational waves been proven to exist? (viewed 17812 times)
Was Stonehenge built to mark solar phenomena? (viewed 17779 times)
What's the object I saw that moved across the sky and then got very bright? (viewed 17772 times)
Are there any dark stars or dark galaxies made of dark matter? (viewed 17767 times)
Is it true that the Sun burns off a billion tons of gas every 5 seconds? (viewed 17723 times)
Why do clocks turn in the opposite direction from the Earth and Moon? (viewed 17697 times)
How does Astronomy involve Chemistry? (viewed 17690 times)
Do astronomers believe in astrology? (viewed 17612 times)
How do scientists slow light down? (viewed 17608 times)
Will we ever stop having solar eclipses because of the moon's motion away from the Earth? (viewed 17568 times)
What process would bring about a quark star? (viewed 17486 times)
Is there a project I can do on black holes? (viewed 17450 times)
Why does the Sun appear larger on the horizon than overhead? (viewed 17431 times)
How do we determine the age of the universe? (viewed 17421 times)
How can we know that there are other galaxies if we cannot leave ours? (viewed 17388 times)
What caused Shoemaker-Levy 9 to split up? (viewed 17388 times)
Did a giant impact cause the Dark Ages? (viewed 17373 times)
How do we know the Milky Way is a spiral galaxy? (viewed 17363 times)
Can astronauts play musical instruments in space? (viewed 17313 times)
Why do we assume that the universe is homogeneous? (viewed 17304 times)
Can supernovae hinder the formation of life in galaxies? (viewed 17283 times)
Why is the shadow on the Moon the shape it is? (viewed 17280 times)
What happens when an antimatter black hole collides with a matter blackhole? (viewed 17279 times)
What are "blue stragglers" in globular clusters? (viewed 17257 times)
Why do we study black holes? (viewed 17228 times)
Why are most months 30 or 31 days long? (viewed 17219 times)
How do planets capture satellites? (viewed 17215 times)
Why are Saturn's rings flat? (viewed 17200 times)
Why are stars of different masses? (viewed 17170 times)
How are galaxies and solar systems similar? (viewed 17143 times)
Is it worthwhile to continue the search for extraterrestrial life? (viewed 17110 times)
What is the solar cycle? (viewed 17085 times)
Which way does the sun travel in the southern hemisphere? (viewed 17080 times)
Who (and when) discovered that the earth's axis is on a 23 degree tilt? (viewed 17071 times)
Why do astronauts in space need to exercise? (viewed 17047 times)
How is it proved that the Universe is expanding? (viewed 16991 times)
How many Astronauts have been in space? (viewed 16912 times)
What are the names of the three stars in Orion's belt? (viewed 16905 times)
Would extraterrestrial civilizations know that there is life on Earth? (viewed 16872 times)
How are planets detected around other stars? (viewed 16871 times)
Does Cerenkov radiation travel faster than light? (viewed 16845 times)
What's the best thing about being an astronomer? (viewed 16824 times)
What would happen if there was a collision between two white dwarfs? (viewed 16824 times)
Is there a list of the sizes of different kinds of stars? (viewed 16822 times)
What is sidereal time? (viewed 16814 times)
How close does a supernova need to be to damage the Earth's environment? (viewed 16767 times)
Could we send a space mission to a comet? (viewed 16719 times)
Could a different theory of gravity explain the dark matter mystery? (viewed 16692 times)
Why are there no craters on Earth? Did all the meteorites miss us? (viewed 16681 times)
How do solar flares affect airline pilots? (viewed 16625 times)
Why is the Hubble Space Telescope in space? (viewed 16624 times)
What happens to the material that has been sucked into a black hole? (viewed 16609 times)
Why doesn't light from distant galaxies reach us instantaneously? (viewed 16608 times)
Why do so many of the world's UFO sightings happen in America? (viewed 16518 times)
Why is Uranus tipped on its side? (viewed 16509 times)
How long does it take the Big Dipper to move in the sky? (viewed 16480 times)
What calculations go into predicting eclipses? (viewed 16479 times)
Is there sound coming from the Sun? (viewed 16474 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 16462 times)
If we invented special suits could we ever go to the sun? (viewed 16454 times)
How can we compare dark matter and dark energy? (viewed 16440 times)
How can we see galaxies if their stars are so faint? (viewed 16431 times)
How different would the night sky have looked in 40,000 B.C.? (viewed 16429 times)
What happens when you change the mass of a White Dwarf or Neutron Star? (viewed 16428 times)
Can double stars have planets? (viewed 16420 times)
As the universe expands, why don't galaxies get stretched out? (viewed 16404 times)
What will happen to the Milky Way in the future? (viewed 16396 times)
How do we know that sunspots are associated with the Sun's magnetic field? (viewed 16379 times)
Can you tell time by the Big Dipper? (viewed 16374 times)
Why do humans want to go in space? (viewed 16361 times)
Are the properties of extrasolar planets known? (viewed 16349 times)
What kind of eyepieces do I need to look at planets? (viewed 16334 times)
Is there any possibility that the Solar System or the Universe is in a black hole? (viewed 16308 times)
How are asteroid compositions and classifications determined? (viewed 16291 times)
Why does one side of Mars look more catastrophic than the other? (viewed 16279 times)
How do I explain to my children why the Moon has phases? (viewed 16230 times)
Could our position in the universe affect our perceptions of the expansion? (viewed 16209 times)
Do similar laws of physics throughout the Universe imply that all life must be like life on Earth? (viewed 16199 times)
Could we be seeing dead stars? (viewed 16191 times)
How powerful are quasars? (viewed 16163 times)
How do I polar align my telescope? (viewed 16149 times)
Can two lunar eclipses occur in the same month? (viewed 16126 times)
Why is the time between two successive full moons different from the lunar synodic month? (viewed 16076 times)
What month was it when Odysseus saw Orion in 1000BC? (viewed 16071 times)
Are there stars outside of galaxies? (viewed 16061 times)
How do sunrise and sunset times change with altitude? (viewed 16034 times)
What colors are visible through an amateur telescope? (viewed 16006 times)
How many comets are currently orbiting our sun? (viewed 15931 times)
Does inflation allow for an infinite number of universes? (viewed 15923 times)
Do unmanned spacecraft like Voyager travel in straight lines? (viewed 15917 times)
How do we know if the universe will keep expanding forever? (viewed 15911 times)
What kind of telescope should I use for astrophotography? (viewed 15770 times)
Can a black hole come back to the visual universe through a "little bang"? (viewed 15770 times)
Where does the kinetic energy of infalling bodies come from? (viewed 15748 times)
How do we feel heat? (viewed 15744 times)
Can the theory of formation of the solar system explain all the observables? (viewed 15741 times)
Can I see details on Venus? (viewed 15724 times)
Can any comparison be made between spiral galaxies and hurricanes? (viewed 15717 times)
What equipment do I need for astrophotography? (viewed 15708 times)
Can I see a quasar? (viewed 15678 times)
How many sunspots can the Sun have at once? (viewed 15631 times)
Can other terrestrial moons be (or have been) stable? (viewed 15617 times)
What happened to all the black holes that were around in the early universe? (viewed 15590 times)
What kind of instruments are used to detect extrasolar planets? (viewed 15590 times)
Could you escape from a black hole if you were able to go faster than the speed of light? (viewed 15575 times)
What is a wormhole? (viewed 15572 times)
Does a photon observe other photons moving past it at the speed of light? (viewed 15557 times)
Why search for only Earth-like life on other planets? (viewed 15549 times)
Why is the Cosmic Microwave Background not absorbed by interstellar hydrogen? (viewed 15543 times)
Why did the Pioneer and Voyager take only 2 years to reach Jupiter, while Galileo and Cassini took more than 5 years? (viewed 15528 times)
Are the planes of solar systems aligned with the plane of the Galaxy? (viewed 15527 times)
How do I become an astronomical artist? (viewed 15521 times)
How long do supernova remnants last? (viewed 15487 times)
Can I build an instrument to measure the size of the Sun and of the Moon? (viewed 15433 times)
How does the Earth compare in size to the entire universe at the present epoch? (viewed 15432 times)
How are supernovae discovered? (viewed 15422 times)
Why does the apparent density of galaxies drop off at larger distances? (viewed 15391 times)
Can gravitational lensing from intervening galaxies cause the observed ripples in the Cosmic Microwave Background? (viewed 15337 times)
What makes a satellite geosyncronise itself with Earth's orbit? (viewed 15294 times)
Is it possible for amateurs to do optical interferometry? (viewed 15286 times)
How can you tell if a crescent moon is preceding or following a new-moon phase? (viewed 15280 times)
Did I really hear a meteor? (viewed 15261 times)
Which part of the sky did the famous 'wow' signal originate from? (viewed 15258 times)
Could there have been multiple Big Bangs at different places in the universe? (viewed 15234 times)
Would the biggest airplanes cause tsunamis if they crashed? (viewed 15218 times)
Why do some eclipses take longer than others? (viewed 15184 times)
Why are there blue shifted galaxies? (viewed 15140 times)
Are there any new craters on the moon? (viewed 15117 times)
Are planetary nebulae the result of supernovae? (viewed 15102 times)
What is meant by "stopping down a telescope"? (viewed 15092 times)
If clocks run slow in a gravitational field, how can we know the true age of the Solar System and Universe? (viewed 15044 times)
Why can we see the sun's image before sunrise and after sunset? (viewed 15032 times)
How was the starting point for the Julian Date system chosen? (viewed 15028 times)
Can you give me advice on buying a telescope? (viewed 14964 times)
Why was the Platonic year named after Plato? (viewed 14947 times)
Is the universe really like an expanding balloon? (viewed 14861 times)
Why doesn't NASA build rotating spacecraft to simulate gravity? (viewed 14838 times)
Is it possible to build a cheap device to measure declination? (viewed 14836 times)
Why don't astronauts sublimate in space? (viewed 14818 times)
Why doesn't the hydrogen on Jupiter explode? (viewed 14816 times)
How is the Cepheid yardstick validated? (viewed 14815 times)
Will we discover an 11th planet? What would it be called? (viewed 14797 times)
If comets are boiling away, why are there any left? (viewed 14758 times)
What class of spiral galaxy is the Milky Way? (viewed 14723 times)
Is there a beginning and an end to a galaxy's life? (viewed 14722 times)
Would a planet near the galactic center have a brighter night sky? (viewed 14722 times)
Can the Space Shuttle abort and return to Earth before reaching orbit? (viewed 14708 times)
How hot is each one of the layers of the sun? (viewed 14694 times)
What is a Cepheid variable? (viewed 14673 times)
What is the difference between homogeneity and isotropy? (viewed 14588 times)
Why is pressure broadening greater in low mass stars than in high mass stars? (viewed 14588 times)
How do astronomers come up with their facts? (viewed 14587 times)
Will I be able to see the shadow of the Moon streaking towards me in a total solar eclipse? (viewed 14586 times)
Why aren't discoveries of extrasolar planets reported on the news? (viewed 14520 times)
Can you describe a day on the job as an astronomer? (viewed 14509 times)
Where can I find information on the moons of other planets? (viewed 14497 times)
How can we tell what the interiors of planets are like? (viewed 14485 times)
Did time go slower just after the Big Bang? (viewed 14460 times)
Does the shuttle worry about space junk? (viewed 14449 times)
Can astronomers observe anything when the moon is full? (viewed 14391 times)
What happened to the girl who named Pluto? (viewed 14354 times)
How are sunspots formed? (viewed 14354 times)
Could dark energy come from matter anti-matter pairs forming spontaneously and then annihilating? (viewed 14330 times)
Could you tell me about the life cycle of galaxies? (viewed 14318 times)
Can HST see the Oort cloud? (viewed 14279 times)
What is the SU(3) quark model? (viewed 14279 times)
What is the origin of the stellar classification system "OBAFGKM"? (viewed 14242 times)
What is our galaxy's halo made of, and how was it formed? (viewed 14223 times)
What are the boundaries of the constellations? (viewed 14196 times)
Can the acceleration of the Universe be analogous to apparent acceleration in a airplane? (viewed 14173 times)
Why is NASA shutting down the Hubble Space Telescope? (viewed 14138 times)
Do galaxies orbit around anything? (viewed 14093 times)
How are astronomy and poetry linked? (viewed 14085 times)
Why doesn't SETI concentrate its observations to the nearby stars and the solar systems that we are discovering? (viewed 14060 times)
What's new with the Big Bang? (viewed 14058 times)
Why are telescopes kept in cold conditions? (viewed 13943 times)
What is the best time of the year to see eclipses? (viewed 13931 times)
How could galaxies have gotten so far away in only 15 billion years? (viewed 13924 times)
Why do supernova remnants look like rings rather than spheres? (viewed 13886 times)
How can we find galaxies behind the Milky Way? (viewed 13884 times)
Have astronomers observed any phenomena that could be produced by extraterrestrial civilizations? (viewed 13861 times)
How can the Sun have such a strong gravitational field if it's made of gasses? (viewed 13818 times)
Does the Sun have any heavy elements? (viewed 13787 times)
Did I find a rock that came from the Moon? (viewed 13763 times)
Could photons be dark matter? (viewed 13755 times)
Is light of different colors affected differently by gravity? (viewed 13714 times)
Why can't relative velocities add up to more than the speed of light? (viewed 13701 times)
Where was the water in the big bang? (viewed 13701 times)
How long is twilight on the Moon? (viewed 13696 times)
On which days can I see the Moon in the evening / morning and why is this so? (viewed 13666 times)
Can I listen to the SETI@home radio signal? (viewed 13619 times)
Does the temperature of matter increase as it is accelerated to relativistic speeds? (viewed 13613 times)
Why are there more maria on the near side of the Moon? (viewed 13601 times)
Do stars' orbits in galaxies obey Kepler's Laws? (viewed 13578 times)
How do bars form in spiral galaxies? (viewed 13505 times)
How long has humanity known that we live in a galaxy similar to others in the Universe? (viewed 13490 times)
What causes a particle to decay? (viewed 13488 times)
How fast do particles travel in space? (viewed 13450 times)
How do astronomers measure the radius of a star? (viewed 13435 times)
What was that eclipse I saw in the sky? (viewed 13407 times)
How much power is contained in a beam of light? (viewed 13406 times)
What would the Big Crunch look like to an observer on Earth? (viewed 13401 times)
What would an "open geometry" for the universe look like? (viewed 13304 times)
Will the diameter of a cluster of galaxies change with redshift? (viewed 13291 times)
How do photons from distant objects maintain enough energy to reach us? (viewed 13286 times)
Do we see the same stars from above and below the equator? (viewed 13263 times)
How do we find out about the star formation histories of galaxies? (viewed 13238 times)
What causes gamma ray bursts? (viewed 13181 times)
Will the next generation telescope OWL be able to detect an Earth like extrasolar planet? (viewed 13158 times)
How do you classify galaxies? (viewed 13103 times)
Can we make a movie of the Milky Way galaxy's rotation? (viewed 13096 times)
Why is it important to study meteorites? (viewed 13089 times)
Can you tell me the characteristics of W, R, N and S type stars? (viewed 13084 times)
What are "curled" dimensions? (viewed 12986 times)
Why are accretion disks flat? (viewed 12963 times)
Are the asteroids the remains of a planet which broke apart? (viewed 12960 times)
How can we understand the meaning of large numbers like "a million million?" (viewed 12885 times)
What kinds of star clusters are there? (viewed 12884 times)
How do we know what other planets (and stars, galaxies, etc.) are made of? (viewed 12868 times)
Wouldn't the vast distances of space distort SETI signals into unintelligeble forms? (viewed 12783 times)
What kind of interference must astronomers contend with when observing? (viewed 12774 times)
How can I contribute to science as an amateur astronomer? (viewed 12751 times)
Do we have to worry about relativity when studying galactic objects? (viewed 12741 times)
When did people discover that the Sun is a star? (viewed 12740 times)
Did the Sumerians measure precession? (viewed 12702 times)
How does interferometry work? (viewed 12688 times)
Will the Leonid meteor shower go away? (viewed 12655 times)
Do electrons age? (viewed 12578 times)
What do "homogeneity" and "isotropy" mean? (viewed 12568 times)
Is there oxygen in the atmospheres of other planets? (viewed 12551 times)
What do stellar classifications mean? (viewed 12458 times)
How do distant galaxies differ from those nearby? (viewed 12393 times)
Why can we have solar eclipses? (viewed 12370 times)
Could we send a manned mission to the outer planets? (viewed 12340 times)
Why are telescopes located in remote places? (viewed 12241 times)
How are astronauts trained for weightlessness? (viewed 12207 times)
Why do spacecraft need heat shields coming back to Earth but not leaving? (viewed 12190 times)
Will astronauts ever be able to go ice-skating on Europa? (viewed 12180 times)
How can you tell the difference between single and multiple extrasolar planets? (viewed 12178 times)
How does melting a material reset its radioactive clock? (viewed 12138 times)
How do astronomers observe the Sun's interior? (viewed 12096 times)
How can I watch the Perseid meteor shower? (viewed 12091 times)
What is the farthest in space that we have gone? (viewed 12087 times)
How did Mars get so dusty? (viewed 12042 times)
How can I nominate myself for a Nobel Prize in Physics? (viewed 12014 times)
Is cosmic expansion happening on microscopic scales? (viewed 12010 times)
What is the three-body problem? (viewed 11983 times)
How does a star take mass from another star? (viewed 11900 times)
Do we really observe the edges of galaxies at different epochs? (viewed 11846 times)
Where can I see Newton's original reflecting telescope? (viewed 11712 times)
How are photons created and destroyed? (viewed 11601 times)
How can water be chemically trapped in rocks? (viewed 11588 times)
Do binary or triple star systems form together? (viewed 11549 times)
How can I find out if the new moon has been sighted? (viewed 11525 times)
If the universe is "bounded" today, could it one day become "unbounded"? (viewed 11514 times)
Why is the WMAP picture of the CMB an ellipse? (viewed 11349 times)
Is light blueshifted when it is gravitationally lensed? (viewed 11302 times)
How does libration allow us to see more than 50% of the Moon? (viewed 11273 times)
What percent of the time can astronomers observe without interference from the Moon? (viewed 11202 times)
Why will fusion wait until hydrogen is gone before starting to fuse heavier atoms? (viewed 11126 times)
What is the best way to see the Milky Way? (viewed 11102 times)
Is the Local Group expanding along with the entire Universe? (viewed 11099 times)
Do asteroids hit the sun? (viewed 11004 times)
What kinds of cancer research have been done in space? (viewed 10904 times)
No matter how fast the universe is expanding, shouldn't gravity eventually make it recollapse? (viewed 10861 times)
How do unmanned space probes avoid running into things? (viewed 10787 times)
Do asteroids ever do anything good in the Solar System? (viewed 10729 times)
What color would Mars be if you were standing on it? (viewed 10701 times)
Why aren't accretion disks around giant stars as hot as accretion disks around black holes? (viewed 10691 times)
How can observations of the distant universe prove that the expansion is accelerating *now*? (viewed 10567 times)
What is "nothing", from a scientific point of view? (viewed 10525 times)
Why is it easier to see a star if you look slightly to the side? (viewed 10480 times)
What would happen if you went back in time and killed your grandmother? (viewed 10402 times)
What is Hot Dark Matter theory? (viewed 10397 times)
Could matter-anti-matter repulsion power the expansion of the universe? (viewed 10368 times)
If the Universe was infinitely dense at the Big Bang, why didn't time stand still? (viewed 10297 times)
What is the photoelectric effect? Why can't multiple low-frequency photons free an electron? (viewed 10083 times)
What do meteorites tell us about life on other planets? (viewed 9987 times)
Why is it called astronomy when all the other sciences end in -ology? (viewed 9814 times)
What are collections of galaxies called? (viewed 9809 times)
Could neutrinos be dark matter? (viewed 9785 times)
How are planets affected by the Hot Ionised Medium? (viewed 9759 times)
Why don't all neutron stars become pulsars? (viewed 9758 times)
Are there any 'lonely galaxies'? (viewed 9700 times)
What was different on Mars in the past to allow liquid water to be present? (viewed 9611 times)
What is the relationship between the width of a star trail on a photo and the star's intensity? (viewed 9537 times)
Can a human give birth in space? (viewed 9475 times)
How can we discern different galaxies/clusters along the same line of sight? (viewed 9444 times)
Why was Mir burnt up in the atmosphere? (viewed 9246 times)
During close approaches, can Mars appear in our sky as large as the Moon? (viewed 9231 times)
Why doesn't the ammonia and methane in Jupiter's atmosphere sink into the core? (viewed 9210 times)
How can the universe be "flat"? We're 3D! (viewed 9173 times)
Do constellations looks the same from space? (viewed 9032 times)
What are the largest radio wavelengths observed from radio sources in the sky? (viewed 8845 times)
Does lunar gardening really work? (viewed 8463 times)
How does the color index of a star relate to its actual color? (viewed 8309 times)
Is it a coincidence that we can have total solar eclipses? Are there other planets which also have them? (viewed 8216 times)
How do we detect incoming meteorites? (viewed 8032 times)
How big is the Hubble Ultra Deep Field image? (viewed 7925 times)
Why is the sky blue and not blue & purple? (viewed 7850 times)
Is the green flash real? (viewed 7682 times)
Do the Earth's magnetic poles ever change places? (viewed 7598 times)
Could the Universe's dark matter be made up of black holes? (viewed 7527 times)
Does weightlessness affect hunger? (viewed 7114 times)
If the sun went out and our atmosphere froze solid, what color would it be? (viewed 7056 times)
If nothing can escape a black hole, why do some black holes have jets? (viewed 6929 times)
How do we know the density of some extrasolar planets? (viewed 6325 times)
Can we harvest H & O from space to make water? (viewed 5833 times)
Can the sun rise from the west on Mars? (viewed 5538 times)
What would happen if a human were exposed to space without wearing a spacesuit? (viewed 5039 times)
What is between the Oort cloud and the closest star? (viewed 5029 times)
Are black holes spherical? (viewed 4770 times)
Has anyone ever seen a star "turn on"? (viewed 4500 times)
Did the Moon or planets form in a manner similar to that of Earth? (viewed 4110 times)
Why don't skydivers burn up like meteors? (viewed 4078 times)
What would happen if a nuclear-powered shuttle exploded? (viewed 4058 times)
When measuring the expansion of the universe, do astronomers consider that they're seeing how galaxies moved long ago, not today? (viewed 3814 times)
Could a planetary system survive if its star merged with another, or if its star went supernova? (viewed 3552 times)
Can we prove that the Moon isn't hollow? (viewed 3517 times)
When will Hale-Bopp return? (viewed 3410 times)
Does the Milky Way spin counter-clockwise? If so, do all spiral galaxies spin in this direction and why? (viewed 3338 times)
Is it sensible to consider terraforming Mars? (viewed 3305 times)
Why are craters round? (viewed 3277 times)
Do planets radiate noise? (viewed 3167 times)
How do supernovae show us that the Universe's expansion is accelerating? (viewed 3121 times)
When will humans travel to Mars and revisit the Moon? (viewed 2667 times)
Can planets collide with one another? (viewed 2600 times)
Are there solar tides? (viewed 2586 times)
If there are infinity universes, will every thing that is possible happen? (viewed 2226 times)
Where is the Spitzer Space Telescope? (viewed 1855 times)
Will the Pioneer and Voyager probes ever leave the Milky Way? (viewed 1755 times)
If I were traveling through space, could I see distant galaxies with my own eyes? (viewed 1665 times)
Does the particles involved in a star's final core collapse travel faster than the speed of light? (viewed 1314 times)
Do more meteorites fall at low latitudes? (viewed 1255 times)
Is Earth-moon tidal friction causing global warming? (viewed 861 times)
Is the moon spherical? (viewed 698 times)
When is the best time to observe zodiacal light? (viewed 659 times)
Is the reddish dust of Mars biogenic? (viewed 621 times)
The naming of Mars (viewed 606 times)
Why does Mars have a dusty atmosphere? (viewed 437 times)
Why does Titan, in spite of being smaller than Mars, have an atmosphere more dense than Earth's? (viewed 410 times)

URL: http://curious.astro.cornell.edu/list.php
This page has been accessed 46375 times since September 25, 2002.
Last modified: November 28, 2003 3:53:21 PM

Comments? curious@astro.cornell.edu
Legal questions? See our copyright, disclaimer and privacy policy.
Ask an Astronomer is hosted by the Astronomy Department at Cornell University and is produced with PHP and MySQL.