All previously answered questions (in order of times viewed)

Is the Moon moving away from the Earth? When was this discovered? (viewed 205753 times)
How do I build a model rocket? (viewed 177265 times)
What color is each planet? (viewed 168409 times)
What is the life cycle of a star? (viewed 150035 times)
How far is each planet from Earth? (viewed 141993 times)
How do you measure the distance between Earth and the Sun? (viewed 138034 times)
What is the largest star? (viewed 120917 times)
What's going to happen on December 21st 2012? (viewed 120681 times)
What is a white hole? (viewed 113473 times)
What color is Venus? (viewed 100887 times)
How many stars are there in our Galaxy (Milky Way)? (viewed 92368 times)
Why do the planets orbit the sun? (viewed 85301 times)
Is the distance from the Earth to the Sun changing? (viewed 84869 times)
What are the names of the earth, moon, sun, and solar system? (viewed 77394 times)
At what speed does the earth move around the sun? (viewed 76825 times)
Which planets have rings? (viewed 75619 times)
Is Pluto a planet? (viewed 70832 times)
Will the sun go supernova in six years and destroy Earth (as seen on Yahoo)? (viewed 67760 times)
What makes the Earth rotate? (viewed 67213 times)
What do astronauts eat in space? Can they grow food? (viewed 61876 times)
Who named the planets and who decides what to name them? (viewed 59898 times)
Why do stars twinkle? (viewed 58074 times)
Does the Moon rotate? Are there other moons that always keep one face toward their planet? (viewed 56961 times)
How long does it take for the Sun's light to reach us? (viewed 55920 times)
Why do planets rotate? (viewed 55538 times)
What is the universe expanding into? (viewed 54913 times)
Where did the name 'Earth' come from? (viewed 54428 times)
What are shooting stars? (viewed 54040 times)
How critical is the Earth-Sun distance in maintaining our average temperatures on Earth? (viewed 53011 times)
Why are there both high and low tides? (viewed 49991 times)
How do we know the age of the Universe and the Earth? (viewed 46714 times)
How many known galaxies are there? (viewed 46048 times)
What is the largest galaxy? (viewed 45643 times)
Did astronauts really go to the Moon, or is it a hoax? (viewed 44917 times)
What was there before the Big Bang and what is there outside of our universe? (viewed 44400 times)
Are there telescopes that can see the flag and lunar rover on the Moon? (viewed 43455 times)
How does the location of sunrise and sunset change throughout the year? (viewed 43263 times)
What will happen to life on Earth when the Sun becomes a red giant? (viewed 41634 times)
Can you hear sounds in space? (viewed 41423 times)
What would happen if an impact caused Earth to stop rotating? (viewed 41240 times)
Have astronomers discovered Earth's second moon? (viewed 41076 times)
What is the observational difference between a star and a planet? (viewed 39990 times)
What is apparent magnitude? (viewed 39165 times)
What kind of rock is the moon made of? (viewed 38313 times)
What is the hottest time of day? (viewed 38307 times)
Is the Sun expanding? Will it ever explode? (viewed 38292 times)
Does the Sun orbit the Earth as well as the Earth orbiting the Sun? (viewed 37424 times)
What would happen if we did not have a Moon? (viewed 36931 times)
Can I buy a star? (viewed 36752 times)
What is the physical difference between a star and a planet? (viewed 36507 times)
Will the magnetic field of the Earth reverse its direction in the future? Will this cause problems? (viewed 36101 times)
How do stars move in the Galaxy? (viewed 36011 times)
When is the next comet due to arrive? (viewed 35742 times)
How does the position of Moonrise and Moonset change? (viewed 35183 times)
What causes seasons? (viewed 35048 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 34627 times)
Why aren't there any green stars? (viewed 34397 times)
How many Earths fit into the Sun? (viewed 33371 times)
Why doesn't the earliest sunset occur on the shortest day of the year? (viewed 32280 times)
How do astronauts take baths and use restrooms in space? (viewed 32147 times)
Is there a proof that Earth moves? (viewed 31922 times)
How do you calculate the lifetime of the Sun? (viewed 31768 times)
Why does the Earth have only one moon? (viewed 31314 times)
What is at the end of the Universe? (viewed 31247 times)
What is a singularity? (viewed 31130 times)
What happens when galaxies collide? (viewed 31091 times)
What direction do planets rotate? (viewed 31059 times)
Why are the Moon and Sun sometimes orange or red? (viewed 30979 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 30940 times)
Who has landed on the moon? (viewed 30922 times)
What is the mass of the Universe? (viewed 30917 times)
Why is a day divided into 24 hours? (viewed 30900 times)
Why are stars and planets round? (viewed 30662 times)
Does the Sun have a scientific name? (viewed 30252 times)
Where does the name "Milky Way" come from? (viewed 30236 times)
What is that ring (or rainbow) around the moon? (viewed 30183 times)
Since Earth is spinning, why do we land in the same place when we jump or fall? (viewed 30124 times)
How much money do astronomers make? (viewed 30102 times)
Is time travel possible? (viewed 29915 times)
How does the Sun compare to other stars? (viewed 29870 times)
Can we feel the Earth spin? (viewed 29748 times)
What are some astronomy science fair projects? (viewed 29358 times)
Is the universe expanding faster than the speed of light? (viewed 29328 times)
Does the Sun move around the Milky Way? (viewed 29042 times)
What are the advantages and disadvantages of using a telescope in space? (viewed 28744 times)
Does the Sun rotate? (viewed 28689 times)
Why do planets have elliptical orbits? (viewed 28634 times)
What would happen if the gravity on Earth was suddenly turned off? (viewed 28625 times)
Can artificial gravity be created in space? (viewed 28416 times)
Where did the Universe come from? (viewed 28340 times)
Why doesn't the length of each day change much around the solstices? (viewed 28110 times)
What are the "dog days of summer"? (viewed 27932 times)
What is the largest structure in the universe? (viewed 27711 times)
How long does a solar eclipse last? (viewed 27578 times)
Traveling at light speed, how long would it take to get to the nearest galaxy? (viewed 27491 times)
Is it possible to measure the temperature of the Sun? (viewed 27480 times)
Do most astronomers believe in God based on the available scientific evidence? (viewed 27258 times)
Why isn't the summer solstice the hottest day of the year? (viewed 27217 times)
How are black holes made? Could one be made close to us? (viewed 27056 times)
Was the Sun made in a supernova? (viewed 27036 times)
How can we see the Milky Way if we are inside it? (viewed 26937 times)
Why do airplanes take longer to fly West than East? (viewed 26901 times)
What would happen if a supermassive black hole came close to the Earth? (viewed 26749 times)
How are light and heavy elements formed? (viewed 26528 times)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (viewed 26521 times)
What is a nova? (viewed 26520 times)
Are there any asteroids on a collision course with Earth? (viewed 26469 times)
What would happen if an asteroid 10 kilometers across hit the Earth? (viewed 26342 times)
What's the best college for astronomy? (viewed 26166 times)
How do rockets work? (viewed 26147 times)
What happens to a substance if its speed is more than the speed of light? (viewed 26075 times)
Does your weight change between the poles and the equator? (viewed 25995 times)
Do stars move in the sky? (viewed 25917 times)
Who first measured the speed of light? (viewed 25899 times)
What elements make up the Sun? (viewed 25713 times)
What can I use for fuel in my homemade rocket? (viewed 25554 times)
How do we know the mass of the Earth and the Moon? (viewed 25546 times)
How can I find the distance to the Sun on any given day? (viewed 25496 times)
When can I see the Moon through the hole in the Pantheon? (viewed 25445 times)
Where are stars born? (viewed 25388 times)
How big is the universe? (viewed 25286 times)
What are RA and DEC? (viewed 25177 times)
If light has no mass, then what draws it into a black hole? (viewed 25176 times)
When the Sun converts mass to energy, do the orbits of the planets change? (viewed 25170 times)
What is the density of a black hole? (viewed 25091 times)
How does the parachute in a model rocket work? (viewed 25063 times)
When will Halley's Comet return? (viewed 25027 times)
How many constellations are there? (viewed 24972 times)
How many stars are born and die each day? (viewed 24765 times)
How do astronomers use math in their jobs? (viewed 24689 times)
Could there be life in the galaxies nearest to the Milky Way? (viewed 24653 times)
How long would it take the Earth to fall into the Sun? (viewed 24539 times)
Where does the name "Moon" come from? (viewed 24346 times)
How do we measure the size of the Moon and of the Sun? (viewed 24286 times)
What is the biggest crater recorded on Earth? (viewed 24165 times)
Where, in relation to the entire universe, is the Milky Way located? (viewed 24115 times)
Will the Sun become a black hole one day? (viewed 24088 times)
How do astronomers measure the brightness of stars? (viewed 23998 times)
How did the stars get named? (viewed 23873 times)
What would you see from inside a black hole? (viewed 23864 times)
What are Altitude and Azimuth? (viewed 23811 times)
Why is it difficult to understand the expansion of the universe? (viewed 23685 times)
What kind of schooling is necessary to become an astronomer? (viewed 23564 times)
Does gravity vary across the surface of the Earth? (viewed 23511 times)
What would happen if Earth had more than one moon? (viewed 23329 times)
Which planet is most similar to Earth? (viewed 23230 times)
How can I measure the distance of a star? (viewed 23221 times)
How can the Universe expand faster than the speed of light during inflation? (viewed 23220 times)
Do dead stars still shine? (viewed 23203 times)
How do astronauts use math in their jobs? (viewed 23125 times)
What is time dilation? (viewed 23019 times)
Are names given to black holes? (viewed 22979 times)
What are constellations used for? (viewed 22912 times)
Does the Moon rotate? (viewed 22897 times)
Why do different stars appear with seasons? (viewed 22863 times)
How does the Moon stay "suspended" in the air? (viewed 22858 times)
Why hasn't NASA gone back to the moon? (viewed 22788 times)
Why does the Earth only see one side of the Moon? (viewed 22785 times)
How often does the Sun pass through a spiral arm in the Milky Way? (viewed 22663 times)
Can I buy land on the Moon? (viewed 22629 times)
How can I find the star I have "bought"? (viewed 22625 times)
Why does Barnard 68 appear dark? (viewed 22600 times)
Why do pictures of distant galaxies have higher resolution than those of nearby planets? (viewed 22587 times)
Why does the Moon look big on the horizon? (viewed 22549 times)
What are black holes made of? (viewed 22468 times)
Why do planets not twinkle? (viewed 22439 times)
How are galaxies formed? (viewed 22433 times)
Why is the Universe flat and not spherical? (viewed 22430 times)
Do black holes die? If so how? (viewed 22409 times)
When was the last time all 9 planets were aligned? (viewed 22361 times)
How do you measure a planet's mass? (viewed 22336 times)
Considering the motion of the Earth, the solar system, and the galaxy, how fast am I moving while lying in bed asleep? (viewed 22316 times)
If the universe is infinite does that mean there is an infinite number of "me"s? (viewed 22215 times)
What makes the wind? (viewed 22200 times)
What is the origin of spiral structure in galaxies? (viewed 22187 times)
Who discovered each planet? (viewed 22095 times)
What is the shape of the universe? (viewed 21997 times)
What do I need to do to become an astronomer? (viewed 21960 times)
What kinds of jobs do astronomers do? (viewed 21945 times)
How do gravitons escape black holes to tell the universe about their gravity? (viewed 21909 times)
How is astronomy impacted by trigonometry? (viewed 21848 times)
How do you calculate the azimuth and altitude of an object? (viewed 21713 times)
Can you fire a gun on the Moon? (viewed 21712 times)
Where is the nearest black hole? (viewed 21681 times)
What other careers involve Astronomy besides Astronomer? (viewed 21643 times)
How much money is spent on space exploration? (viewed 21576 times)
What's the difference between astronomy and astrology? (viewed 21494 times)
What happens when two black holes get too close? (viewed 21479 times)
What was that really big falling star that I saw? (viewed 21459 times)
Why is sea water salty, and not lake water? (viewed 21350 times)
How did asteroids form and what is the difference between an asteroid and a comet? (viewed 21295 times)
What would happen if the Moon fell out of its orbit around Earth? (viewed 21218 times)
Why is the moon in a different place every night? (viewed 21087 times)
What is the size of the Solar System? (viewed 21052 times)
How much longer will the Earth last? (viewed 20924 times)
Why have star signs shifted by one constellation? (viewed 20799 times)
Why is the Moon so bright? (viewed 20763 times)
Is the speed of light constant? (viewed 20727 times)
Would your weight change as you go underground? (viewed 20705 times)
What can we learn from the color of a star? (viewed 20680 times)
Will we get sucked into the black hole at the center of the Milky Way? (viewed 20636 times)
Did life originate on Earth, or did it come from somewhere else? (viewed 20616 times)
How do rockets move in space? (viewed 20611 times)
How do you measure the mass of a star? (viewed 20591 times)
Do the Sun's or Earth's magnetic field reverse? (viewed 20553 times)
What would happen to us if the sun went out for an hour? (viewed 20535 times)
How can two moons of Saturn share the same orbit? (viewed 20505 times)
Are aliens or UFOs real? (viewed 20497 times)
Why do all the planets orbit in the same plane? (viewed 20484 times)
How do galaxies collide in an expanding universe? (viewed 20470 times)
Can I calculate the size of the Universe by converting light years to kilometres? (viewed 20377 times)
Why do the size and brightness of the full moon change? (viewed 20371 times)
What are some of the effects of solar flares on Earth? (viewed 20299 times)
How can I find my age on another planet? (viewed 20236 times)
Is time travel possible using merging black holes? (viewed 20213 times)
What makes up most of the Universe? (viewed 20199 times)
How fast is the Universe expanding? (viewed 20077 times)
What is the size of a black hole? (viewed 19970 times)
How can a star burn with no oxygen? (viewed 19962 times)
What is the typical size of a visible shooting star? (viewed 19952 times)
How can I calculate distances between stars? (viewed 19951 times)
What is the difference between a "star" and a "sun"? (viewed 19943 times)
What would happen to the Earth if an asteroid hit the Moon? (viewed 19932 times)
What is the pattern to the distances between each planet and the sun? (viewed 19932 times)
Why can't you see stars during the day? (viewed 19912 times)
Does Mt. Everest cast a shadow on the moon? (viewed 19891 times)
Can terrestrial planets have rings? (viewed 19813 times)
What is the speed of gravity? (viewed 19799 times)
How can I calculate the position or path of the Sun for a given time and location? (viewed 19742 times)
Why is twilight short near the equator? (viewed 19720 times)
Is the Earth slowly getting larger? (viewed 19622 times)
How would the weather on Earth be different if it were a cube? (viewed 19613 times)
Has there been an experiment that measured speed faster than the speed of light in vacuum? (viewed 19596 times)
Do supermassive black holes cause galaxy rotation? (viewed 19575 times)
Is the Great Wall the largest galaxy cluster? (viewed 19565 times)
Why does the location of sunrise change? (viewed 19558 times)
Why doesn't dark matter fall into a black hole? (viewed 19555 times)
Why do stars change colour when they twinkle? (viewed 19536 times)
How do I tell which planet is which? (viewed 19522 times)
What's the biggest meteorite? (viewed 19482 times)
Could someone travel the universe in his or her own lifetime? (viewed 19482 times)
Why does the Earth tilt back and forward once a year? (viewed 19443 times)
Can we look back far enough in time to see the Big Bang? (viewed 19425 times)
Why don't astronomers use everyday units to measure distances (what is an AU or a pc)? (viewed 19407 times)
Where did all the water in the universe come from? (viewed 19337 times)
Where is the supernova remnant that led to our solar system? (viewed 19316 times)
Does the Coriolis force determine which way my toilet drains? Does it affect black holes? (viewed 19172 times)
What is the approximate GPA needed in High School in Math and Science to be an astronomer? (viewed 19157 times)
How can we estimate the number of Earth-like planets in the Galaxy? (viewed 19052 times)
What do astronauts do all day in the International Space Station? (viewed 19038 times)
How many stars can I see? (viewed 19022 times)
Does quantum entanglement imply faster than light communication? (viewed 18992 times)
Are time machines possible? (viewed 18974 times)
What happens to a bullet fired on the moon? (viewed 18945 times)
What is the evidence supporting the nebula theory of Solar System formation? (viewed 18903 times)
Why can't we see Venus at night when it is an inner planet? (viewed 18902 times)
Is Andromeda part of the Milky Way? Where can I find them in the sky? (viewed 18832 times)
Are meteorites hot or cold when they hit Earth? (viewed 18787 times)
How are black holes discovered? (viewed 18755 times)
Are all stars the same? (viewed 18654 times)
What are the different kinds of astronomers? (viewed 18643 times)
How are elements heavier than iron formed? (viewed 18597 times)
Why are there stars? (viewed 18588 times)
Can you see satellites? (viewed 18572 times)
How does night and day work? (viewed 18559 times)
Which constellation does our Sun belong to? (viewed 18473 times)
Why do we see stars? (viewed 18382 times)
Can a lunar and a solar eclipse happen in the same month? When will this happen next? (viewed 18369 times)
Is there really a 10th planet? (viewed 18277 times)
How do I make a scale model of the Solar System? (viewed 18228 times)
Can you see the future as you fall into a black hole? (viewed 18176 times)
Why is our solar system so different from all the others we've found? (viewed 18123 times)
Why does the Sun's apparent path through the sky change throughout the year? (viewed 18114 times)
What is the significance of the second focus of elliptical orbits of planets in our Solar System? (viewed 18107 times)
Is the Moon hollow? (viewed 18071 times)
What is a star's "spectrum"? (viewed 18043 times)
How long does the supernova stage of a star last? (viewed 18034 times)
Are Earth and the Moon "twin planets"? (viewed 17984 times)
What is the difference between the "Doppler" redshift and the "gravitational" or "cosmological" redshift? (viewed 17930 times)
Can any galaxies be seen with the naked eye? (viewed 17902 times)
Is it possible to count the stars? (viewed 17877 times)
Can we colonize other planets? (viewed 17856 times)
Can I communicate faster than light? (viewed 17851 times)
Why is looking out the same as looking back in time? (viewed 17820 times)
What is Earthrise over the Moon? (viewed 17819 times)
Is it possible to see the full Moon and the Sun simultaneously in high northern latitudes when the Sun doesn't set? (viewed 17818 times)
What are the facts about the Star of Bethlehem? (viewed 17791 times)
If a white dwarf is a "dead" star, why is it so hot? (viewed 17791 times)
Which hemisphere has the best view of the Milky Way? (viewed 17761 times)
How long would it take for a mini-black hole to eat the Earth? (viewed 17754 times)
How dangerous are the asteroids? (viewed 17704 times)
If the universe is 15 billion years old, how can it be larger than 15 billion light years across? (viewed 17646 times)
How close do you have to come to the Earth to be influenced by its gravity? (viewed 17643 times)
Which American colleges teach astronomy? (viewed 17638 times)
What are the atmospheres of Mars and Pluto like? (viewed 17600 times)
How do we measure distances to other stars? (viewed 17581 times)
Don't tachyons travel faster than light? (viewed 17439 times)
How do we know that nuclear fusion is still going on in the Sun? (viewed 17437 times)
How does the brightness of a star depend on its distance from us? (viewed 17430 times)
Was I hit by a meteorite? (viewed 17345 times)
Is there a "South Star"? (viewed 17331 times)
Why do most moons orbit their planets at the equator? (viewed 17309 times)
Will winter and summer constellations change due to abnormal warmth or cold on Earth? (viewed 17262 times)
How do we define distance in an expanding universe? (viewed 17251 times)
Does evolution contradict the second law of thermodynamics? (viewed 17233 times)
How is the time of sunrise calculated? (viewed 17233 times)
What are the closest and/or brightest stars? (viewed 17191 times)
Can we find the place where the Big Bang happened? (viewed 17182 times)
How does light pollution affect astronomers? (viewed 17102 times)
Can life exist on the recently discovered extrasolar planets? (viewed 17089 times)
Why do we not have eclipses every month? (viewed 17062 times)
Aren't jobs in astronomy scarce? (viewed 17041 times)
Why doesn't gravity change the speed of light? (viewed 17038 times)
Is there any limitation to what a black hole can "suck" in? (viewed 17034 times)
How big a change in the Earth's orbit would be required to destroy all life? (viewed 16998 times)
What is a graviton? (viewed 16994 times)
Where did the matter in the universe come from? (viewed 16990 times)
Can a person go into a black hole and come out alive? (viewed 16986 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 16986 times)
What is the most distant known galaxy? (viewed 16956 times)
What is happening just around the black hole in the center of the Milky Way? (viewed 16933 times)
What is a Dyson Sphere? (viewed 16909 times)
What's the difference between astronomy and astrophysics? (viewed 16904 times)
What are quasars made of? (viewed 16903 times)
Why do photos of space taken from space never show any stars? (viewed 16873 times)
Why do constellations look the same after several years even though all the stars are moving? (viewed 16829 times)
What skills do astronomers need? (viewed 16780 times)
Are there eclipses on other planets? (viewed 16674 times)
When we look back to the Big Bang, why don't we see the universe as a tiny speck of matter? (viewed 16669 times)
How do we know what parameters to use when simulating the collision of the Milky Way and Andromeda? (viewed 16646 times)
What happens to spacetime inside a black hole? (viewed 16592 times)
Has anyone made a map of the Milky Way? (viewed 16576 times)
What's so exciting about the new planet around 55 Cancri? (viewed 16567 times)
Do you believe in UFOs? (viewed 16523 times)
Could the Universe have expanded faster than the speed of light at the Big Bang? (viewed 16521 times)
Who came up with the name "black hole"? (viewed 16517 times)
What do a galaxy's colors mean? Are they its true colors? (viewed 16507 times)
How many moles of stars are in the known universe? (viewed 16500 times)
Is the Earth at the centre of the Universe? (viewed 16369 times)
How will the two black holes that are going to collide affect Earth? (viewed 16358 times)
What are the requirements for being a planet? (viewed 16344 times)
Is the Milky Way a collision of two galaxies? (viewed 16277 times)
Is the gravitational force exerted by the Earth on the Moon equal to the centripetal force acting on the Moon? (viewed 16238 times)
Do you think it's possible to maintain life on other planets? (viewed 16222 times)
Is there a simple formula to calculate solar eclipse timings from any position on Earth? (viewed 16222 times)
What is dark matter? (viewed 16179 times)
How can I tell if the rock I found is a meteorite? (viewed 16150 times)
Is there such a thing as hyperspace? (viewed 16129 times)
Is infinite temperature possible? (viewed 16083 times)
Will the seasons change due to precession? (viewed 16064 times)
What would happen if two stars collided? (viewed 16038 times)
How can we measure distances to more stars? (viewed 16036 times)
When are there 5 Sundays in February? (viewed 16030 times)
Was Stonehenge built to mark solar phenomena? (viewed 15986 times)
How many meteorites hit Earth each year? (viewed 15984 times)
How are galaxies named? (viewed 15949 times)
Could an astronaut or satellite fall into a black hole that we didn't know about? (viewed 15939 times)
What supernova created the Crab nebula? (viewed 15925 times)
How are galaxy distances inferred from their recessional velocities? (viewed 15904 times)
Will the Moon be invisible in 500 million years? (viewed 15899 times)
Why do people draw stars with five points? (viewed 15884 times)
Have gravitational waves been proven to exist? (viewed 15851 times)
Can moons have moons? (viewed 15851 times)
What's that dark spot on the Sun? (viewed 15842 times)
Does the Mediterranean sea have tides? (viewed 15838 times)
How long has there been water on Earth? (viewed 15827 times)
Do the magnitudes and colors of stars ever change? (viewed 15807 times)
What type of energy does a black hole have? (viewed 15772 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 15765 times)
How do I become both an astronaut and an astronomer? (viewed 15736 times)
Can superheavy elements (such as Z=116 or 118) be formed in a supernova? Can we observe them? (viewed 15717 times)
How do we weigh objects in space? (viewed 15711 times)
Are Kuiper Belt Objects asteroids? Are large Kuiper Belt Objects planets? (viewed 15701 times)
What is a dimension? (viewed 15692 times)
What caused Shoemaker-Levy 9 to split up? (viewed 15673 times)
How close was the Moon to the Earth when it formed? (viewed 15633 times)
How do asteroids, meteors and comets disappear? (viewed 15606 times)
Are there any dark stars or dark galaxies made of dark matter? (viewed 15597 times)
What would happen if you took off your helmet in space? (viewed 15591 times)
How big was the Sun when it first "fired up"? (viewed 15563 times)
What companies or businesses can astronomers work for? (viewed 15535 times)
Why do the explosions of Type Ia supernovae have a more predictable spectrum than those of regular Type II supernovae? (viewed 15533 times)
How much time do astronomers spend looking through telescopes? (viewed 15513 times)
What process would bring about a quark star? (viewed 15463 times)
Is the Sun always up for exactly 12 hours at the equator? (viewed 15463 times)
Have there been other Big Bangs before? (viewed 15461 times)
How is it that we see farther out in space (farther back in time) than in the past? (viewed 15428 times)
How fast does the Earth go at perihelion and aphelion? (viewed 15409 times)
Can we see dead stars with the naked eye? (viewed 15392 times)
Did a giant impact cause the Dark Ages? (viewed 15371 times)
If gravity is a "curvature of space" rather than a force, why do a ball and bullet follow different paths? (viewed 15354 times)
Can astronauts produce water in space? (viewed 15352 times)
What are "blue stragglers" in globular clusters? (viewed 15332 times)
How far does a galaxy extend? (viewed 15309 times)
What does the term "visible universe" mean? (viewed 15266 times)
How do scientists slow light down? (viewed 15230 times)
Why do clocks turn in the opposite direction from the Earth and Moon? (viewed 15229 times)
How does astronomy benefit humankind? (viewed 15220 times)
Do astronomers believe in astrology? (viewed 15163 times)
Did the speed of light change over the history of the universe? (viewed 15144 times)
Why isn't the sky bright at night if the universe has so many stars? (viewed 15122 times)
How can geometry be different in space? (viewed 15120 times)
Will we ever stop having solar eclipses because of the moon's motion away from the Earth? (viewed 15041 times)
Could we send a space mission to a comet? (viewed 15033 times)
How are galaxies and solar systems similar? (viewed 14952 times)
How are asteroid compositions and classifications determined? (viewed 14870 times)
How do solar flares affect airline pilots? (viewed 14867 times)
Is it true that the Sun burns off a billion tons of gas every 5 seconds? (viewed 14862 times)
Why do we study black holes? (viewed 14840 times)
Does Cerenkov radiation travel faster than light? (viewed 14819 times)
Why does the Sun appear larger on the horizon than overhead? (viewed 14771 times)
What is the difference between nutation and precession of the Earth? (viewed 14749 times)
What if the Earth rotated twice as fast? (viewed 14744 times)
Is there a project I can do on black holes? (viewed 14742 times)
Are the properties of extrasolar planets known? (viewed 14710 times)
How long could life on Earth survive if the Sun stopped shining? (viewed 14681 times)
How do the astronauts communicate in space if sound cannot travel in a vacuum? (viewed 14679 times)
What's the best thing about being an astronomer? (viewed 14675 times)
How can we know that there are other galaxies if we cannot leave ours? (viewed 14649 times)
Can double stars have planets? (viewed 14589 times)
Why does the SETI project search for radio signals? (viewed 14583 times)
Why are Saturn's rings flat? (viewed 14565 times)
Why is the Hubble Space Telescope in space? (viewed 14535 times)
How much can the location of sunset differ from due West? (viewed 14531 times)
Wouldn't the Big Bang theory be considered a hypothesis and not a theory? (viewed 14523 times)
Why do so many of the world's UFO sightings happen in America? (viewed 14471 times)
Why are the compositions of comets and asteroids different? (viewed 14444 times)
How close does a supernova need to be to damage the Earth's environment? (viewed 14444 times)
What month was it when Odysseus saw Orion in 1000BC? (viewed 14434 times)
Can one star orbit another? (viewed 14403 times)
How will a change in the speed of light affect the evolution of the Universe? (viewed 14382 times)
How does Astronomy involve Chemistry? (viewed 14367 times)
What calculations go into predicting eclipses? (viewed 14347 times)
How powerful are quasars? (viewed 14300 times)
If we invented special suits could we ever go to the sun? (viewed 14275 times)
How do we determine the age of the universe? (viewed 14271 times)
Can you tell time by the Big Dipper? (viewed 14250 times)
What's the difference between dark matter and dark energy? (viewed 14233 times)
Is there sound coming from the Sun? (viewed 14220 times)
Is there a list of the sizes of different kinds of stars? (viewed 14183 times)
What kind of telescope should I use for astrophotography? (viewed 14180 times)
Do we know everything about the Sun? (viewed 14174 times)
Can supernovae hinder the formation of life in galaxies? (viewed 14169 times)
What happens when an antimatter black hole collides with a matter blackhole? (viewed 14169 times)
Why don't people walk upside-down on the bottom of the Earth? (viewed 14144 times)
When unmanned spacecraft accelerate in space, what causes them to slow down? (viewed 14131 times)
Is it worthwhile to continue the search for extraterrestrial life? (viewed 14117 times)
What equipment do I need for astrophotography? (viewed 14103 times)
What are the names of the three stars in Orion's belt? (viewed 14096 times)
Why are there no craters on Earth? Did all the meteorites miss us? (viewed 14074 times)
Can other terrestrial moons be (or have been) stable? (viewed 14073 times)
Does the Sun have an iron surface? (viewed 14072 times)
What happens when you change the mass of a White Dwarf or Neutron Star? (viewed 14068 times)
Where do planetary rings come from, and what are they made of? (viewed 14068 times)
Can "tired light theory" explain the observed redshifts of galaxies? (viewed 14064 times)
Could we be seeing dead stars? (viewed 14050 times)
Can two lunar eclipses occur in the same month? (viewed 14029 times)
What will happen to the Milky Way in the future? (viewed 13998 times)
What happens to the material that has been sucked into a black hole? (viewed 13985 times)
Is there any possibility that the Solar System or the Universe is in a black hole? (viewed 13951 times)
Is it possible for amateurs to do optical interferometry? (viewed 13949 times)
What is the farthest Northern Latitude in which the Magellanic Clouds can be seen? (viewed 13939 times)
Could a different theory of gravity explain the dark matter mystery? (viewed 13929 times)
Can the theory of formation of the solar system explain all the observables? (viewed 13918 times)
Did I see the Aurora Borealis as a child? (viewed 13888 times)
Why are there active volcanos on Io? (viewed 13887 times)
Can I see a quasar? (viewed 13871 times)
How do we know that superclusters are the largest structures in the universe? (viewed 13864 times)
How do we know if the universe will keep expanding forever? (viewed 13860 times)
How are planets detected around other stars? (viewed 13856 times)
Can I build an instrument to measure the size of the Sun and of the Moon? (viewed 13851 times)
Can you use an infinite line of reflectors to send light to the edge of the Universe? (viewed 13836 times)
Can a black hole come back to the visual universe through a "little bang"? (viewed 13824 times)
How can we see galaxies if their stars are so faint? (viewed 13812 times)
Why is the time between two successive full moons different from the lunar synodic month? (viewed 13802 times)
How long does it take the Big Dipper to move in the sky? (viewed 13802 times)
How do I explain to my children why the Moon has phases? (viewed 13800 times)
How many comets are currently orbiting our sun? (viewed 13778 times)
What is sidereal time? (viewed 13749 times)
Why did the Pioneer and Voyager take only 2 years to reach Jupiter, while Galileo and Cassini took more than 5 years? (viewed 13741 times)
How do astronauts communicate with their families from space? (viewed 13723 times)
As the universe expands, why don't galaxies get stretched out? (viewed 13720 times)
Did I really hear a meteor? (viewed 13718 times)
Would extraterrestrial civilizations know that there is life on Earth? (viewed 13685 times)
Why is the shadow on the Moon the shape it is? (viewed 13682 times)
How are supernovae discovered? (viewed 13643 times)
How many sunspots can the Sun have at once? (viewed 13637 times)
How do sunrise and sunset times change with altitude? (viewed 13618 times)
What makes a satellite geosyncronise itself with Earth's orbit? (viewed 13544 times)
How long do supernova remnants last? (viewed 13536 times)
Why are stars of different masses? (viewed 13528 times)
Are planetary nebulae the result of supernovae? (viewed 13512 times)
How do planets capture satellites? (viewed 13505 times)
Can I see details on Venus? (viewed 13455 times)
What is the solar cycle? (viewed 13430 times)
What happened to all the black holes that were around in the early universe? (viewed 13429 times)
Will I be able to see the shadow of the Moon streaking towards me in a total solar eclipse? (viewed 13363 times)
What's the object I saw that moved across the sky and then got very bright? (viewed 13352 times)
Is it possible to build a cheap device to measure declination? (viewed 13347 times)
Could there have been multiple Big Bangs at different places in the universe? (viewed 13323 times)
How do I polar align my telescope? (viewed 13316 times)
How can you tell if a crescent moon is preceding or following a new-moon phase? (viewed 13300 times)
How different would the night sky have looked in 40,000 B.C.? (viewed 13274 times)
How do we know the Milky Way is a spiral galaxy? (viewed 13269 times)
If comets are boiling away, why are there any left? (viewed 13264 times)
How does the Earth compare in size to the entire universe at the present epoch? (viewed 13243 times)
Would the biggest airplanes cause tsunamis if they crashed? (viewed 13223 times)
Are there stars outside of galaxies? (viewed 13220 times)
Why are there blue shifted galaxies? (viewed 13178 times)
Can any comparison be made between spiral galaxies and hurricanes? (viewed 13165 times)
What kind of eyepieces do I need to look at planets? (viewed 13160 times)
What is a Cepheid variable? (viewed 13156 times)
The Moon slows the Earth's rotation, but how fast was it spinning billions of years ago? (viewed 13129 times)
Why is pressure broadening greater in low mass stars than in high mass stars? (viewed 13109 times)
Why doesn't the hydrogen on Jupiter explode? (viewed 13102 times)
Can astronauts play musical instruments in space? (viewed 13078 times)
Can you give me advice on buying a telescope? (viewed 13066 times)
Are there any new craters on the moon? (viewed 13063 times)
How do astronomers come up with their facts? (viewed 13057 times)
Why do astronauts in space need to exercise? (viewed 13051 times)
How was the starting point for the Julian Date system chosen? (viewed 12952 times)
Why search for only Earth-like life on other planets? (viewed 12947 times)
If clocks run slow in a gravitational field, how can we know the true age of the Solar System and Universe? (viewed 12944 times)
What class of spiral galaxy is the Milky Way? (viewed 12937 times)
Can HST see the Oort cloud? (viewed 12916 times)
Where can I find information on the moons of other planets? (viewed 12911 times)
What would happen if there was a collision between two white dwarfs? (viewed 12895 times)
How is the Cepheid yardstick validated? (viewed 12886 times)
Why are most months 30 or 31 days long? (viewed 12862 times)
How hot is each one of the layers of the sun? (viewed 12836 times)
Does the shuttle worry about space junk? (viewed 12829 times)
Would a planet near the galactic center have a brighter night sky? (viewed 12813 times)
Are the planes of solar systems aligned with the plane of the Galaxy? (viewed 12808 times)
Why do we assume that the universe is homogeneous? (viewed 12786 times)
Why doesn't NASA build rotating spacecraft to simulate gravity? (viewed 12766 times)
Why doesn't light from distant galaxies reach us instantaneously? (viewed 12729 times)
What kind of instruments are used to detect extrasolar planets? (viewed 12717 times)
What colors are visible through an amateur telescope? (viewed 12701 times)
Can the acceleration of the Universe be analogous to apparent acceleration in a airplane? (viewed 12651 times)
How is it proved that the Universe is expanding? (viewed 12635 times)
How do we feel heat? (viewed 12634 times)
What are the boundaries of the constellations? (viewed 12628 times)
Why does one side of Mars look more catastrophic than the other? (viewed 12606 times)
Why are telescopes kept in cold conditions? (viewed 12600 times)
What is the difference between homogeneity and isotropy? (viewed 12591 times)
Could you escape from a black hole if you were able to go faster than the speed of light? (viewed 12571 times)
Why is NASA shutting down the Hubble Space Telescope? (viewed 12552 times)
What is the origin of the stellar classification system "OBAFGKM"? (viewed 12518 times)
Will we discover an 11th planet? What would it be called? (viewed 12518 times)
What is a wormhole? (viewed 12516 times)
What is the best time of the year to see eclipses? (viewed 12511 times)
How do I become an astronomical artist? (viewed 12507 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 12499 times)
Which part of the sky did the famous 'wow' signal originate from? (viewed 12483 times)
Why do some eclipses take longer than others? (viewed 12480 times)
What's new with the Big Bang? (viewed 12472 times)
Which way does the sun travel in the southern hemisphere? (viewed 12451 times)
How could galaxies have gotten so far away in only 15 billion years? (viewed 12430 times)
Why do supernova remnants look like rings rather than spheres? (viewed 12420 times)
Could dark energy come from matter anti-matter pairs forming spontaneously and then annihilating? (viewed 12394 times)
Where does the kinetic energy of infalling bodies come from? (viewed 12379 times)
How do we know that sunspots are associated with the Sun's magnetic field? (viewed 12377 times)
Could our position in the universe affect our perceptions of the expansion? (viewed 12328 times)
What is the SU(3) quark model? (viewed 12328 times)
Does the temperature of matter increase as it is accelerated to relativistic speeds? (viewed 12296 times)
How can we tell what the interiors of planets are like? (viewed 12295 times)
How many Astronauts have been in space? (viewed 12273 times)
How much power is contained in a beam of light? (viewed 12269 times)
Is light of different colors affected differently by gravity? (viewed 12256 times)
How can we compare dark matter and dark energy? (viewed 12234 times)
How can the Sun have such a strong gravitational field if it's made of gasses? (viewed 12221 times)
Did time go slower just after the Big Bang? (viewed 12214 times)
Why can we see the sun's image before sunrise and after sunset? (viewed 12203 times)
How are astronomy and poetry linked? (viewed 12197 times)
Can you describe a day on the job as an astronomer? (viewed 12197 times)
Do galaxies orbit around anything? (viewed 12173 times)
Do unmanned spacecraft like Voyager travel in straight lines? (viewed 12141 times)
Could photons be dark matter? (viewed 12135 times)
How can we find galaxies behind the Milky Way? (viewed 12127 times)
Why aren't discoveries of extrasolar planets reported on the news? (viewed 12126 times)
Why can't relative velocities add up to more than the speed of light? (viewed 12125 times)
Did I find a rock that came from the Moon? (viewed 12109 times)
Who (and when) discovered that the earth's axis is on a 23 degree tilt? (viewed 12096 times)
What causes a particle to decay? (viewed 12089 times)
How long has humanity known that we live in a galaxy similar to others in the Universe? (viewed 12081 times)
Is the universe really like an expanding balloon? (viewed 12075 times)
Will the diameter of a cluster of galaxies change with redshift? (viewed 12052 times)
Is there a beginning and an end to a galaxy's life? (viewed 12034 times)
Does inflation allow for an infinite number of universes? (viewed 12009 times)
Does a photon observe other photons moving past it at the speed of light? (viewed 11989 times)
Do similar laws of physics throughout the Universe imply that all life must be like life on Earth? (viewed 11936 times)
Why was the Platonic year named after Plato? (viewed 11931 times)
What was that eclipse I saw in the sky? (viewed 11921 times)
Why is the Cosmic Microwave Background not absorbed by interstellar hydrogen? (viewed 11911 times)
Have astronomers observed any phenomena that could be produced by extraterrestrial civilizations? (viewed 11896 times)
How long is twilight on the Moon? (viewed 11890 times)
Why are there more maria on the near side of the Moon? (viewed 11858 times)
Can you tell me the characteristics of W, R, N and S type stars? (viewed 11854 times)
How fast do particles travel in space? (viewed 11766 times)
Where was the water in the big bang? (viewed 11763 times)
How do photons from distant objects maintain enough energy to reach us? (viewed 11763 times)
Why does the apparent density of galaxies drop off at larger distances? (viewed 11750 times)
What would the Big Crunch look like to an observer on Earth? (viewed 11733 times)
Why do humans want to go in space? (viewed 11728 times)
Do stars' orbits in galaxies obey Kepler's Laws? (viewed 11674 times)
How do bars form in spiral galaxies? (viewed 11658 times)
How do we find out about the star formation histories of galaxies? (viewed 11618 times)
What kind of interference must astronomers contend with when observing? (viewed 11598 times)
Why don't astronauts sublimate in space? (viewed 11595 times)
Can I listen to the SETI@home radio signal? (viewed 11549 times)
How can we understand the meaning of large numbers like "a million million?" (viewed 11547 times)
How do you classify galaxies? (viewed 11515 times)
Can gravitational lensing from intervening galaxies cause the observed ripples in the Cosmic Microwave Background? (viewed 11513 times)
Will the next generation telescope OWL be able to detect an Earth like extrasolar planet? (viewed 11500 times)
Do we have to worry about relativity when studying galactic objects? (viewed 11495 times)
Why doesn't SETI concentrate its observations to the nearby stars and the solar systems that we are discovering? (viewed 11493 times)
Could you tell me about the life cycle of galaxies? (viewed 11450 times)
Do we see the same stars from above and below the equator? (viewed 11449 times)
What are "curled" dimensions? (viewed 11441 times)
Wouldn't the vast distances of space distort SETI signals into unintelligeble forms? (viewed 11420 times)
Does the Sun have any heavy elements? (viewed 11384 times)
Can the Space Shuttle abort and return to Earth before reaching orbit? (viewed 11365 times)
What kinds of star clusters are there? (viewed 11333 times)
Are the asteroids the remains of a planet which broke apart? (viewed 11260 times)
What would an "open geometry" for the universe look like? (viewed 11256 times)
How can I contribute to science as an amateur astronomer? (viewed 11231 times)
Why is it important to study meteorites? (viewed 11217 times)
Why is Uranus tipped on its side? (viewed 11209 times)
How does interferometry work? (viewed 11177 times)
What is meant by "stopping down a telescope"? (viewed 11163 times)
What is our galaxy's halo made of, and how was it formed? (viewed 11110 times)
Do electrons age? (viewed 11089 times)
How do astronomers measure the radius of a star? (viewed 11010 times)
What do stellar classifications mean? (viewed 10989 times)
Will the Leonid meteor shower go away? (viewed 10970 times)
How can you tell the difference between single and multiple extrasolar planets? (viewed 10948 times)
How do distant galaxies differ from those nearby? (viewed 10931 times)
What causes gamma ray bursts? (viewed 10848 times)
How are astronauts trained for weightlessness? (viewed 10772 times)
Can astronomers observe anything when the moon is full? (viewed 10752 times)
How can I watch the Perseid meteor shower? (viewed 10731 times)
What is the three-body problem? (viewed 10675 times)
Why can we have solar eclipses? (viewed 10666 times)
Will astronauts ever be able to go ice-skating on Europa? (viewed 10657 times)
How did Mars get so dusty? (viewed 10607 times)
Is cosmic expansion happening on microscopic scales? (viewed 10569 times)
How can I nominate myself for a Nobel Prize in Physics? (viewed 10522 times)
How does a star take mass from another star? (viewed 10505 times)
What happened to the girl who named Pluto? (viewed 10491 times)
Could we send a manned mission to the outer planets? (viewed 10466 times)
Why do spacecraft need heat shields coming back to Earth but not leaving? (viewed 10430 times)
How does melting a material reset its radioactive clock? (viewed 10334 times)
Do binary or triple star systems form together? (viewed 10241 times)
Why are accretion disks flat? (viewed 10214 times)
Do we really observe the edges of galaxies at different epochs? (viewed 10205 times)
How can water be chemically trapped in rocks? (viewed 10175 times)
How do astronomers observe the Sun's interior? (viewed 10168 times)
If the universe is "bounded" today, could it one day become "unbounded"? (viewed 10146 times)
What is the farthest in space that we have gone? (viewed 9977 times)
Is light blueshifted when it is gravitationally lensed? (viewed 9977 times)
Is there oxygen in the atmospheres of other planets? (viewed 9928 times)
How can I find out if the new moon has been sighted? (viewed 9914 times)
How does libration allow us to see more than 50% of the Moon? (viewed 9882 times)
What percent of the time can astronomers observe without interference from the Moon? (viewed 9812 times)
Why are telescopes located in remote places? (viewed 9758 times)
Why is the WMAP picture of the CMB an ellipse? (viewed 9740 times)
On which days can I see the Moon in the evening / morning and why is this so? (viewed 9710 times)
How are sunspots formed? (viewed 9672 times)
What do "homogeneity" and "isotropy" mean? (viewed 9662 times)
Did the Sumerians measure precession? (viewed 9593 times)
Is the Local Group expanding along with the entire Universe? (viewed 9446 times)
No matter how fast the universe is expanding, shouldn't gravity eventually make it recollapse? (viewed 9404 times)
What kinds of cancer research have been done in space? (viewed 9357 times)
Why aren't accretion disks around giant stars as hot as accretion disks around black holes? (viewed 9355 times)
How do we know what other planets (and stars, galaxies, etc.) are made of? (viewed 9345 times)
Why will fusion wait until hydrogen is gone before starting to fuse heavier atoms? (viewed 9326 times)
Why is it easier to see a star if you look slightly to the side? (viewed 9113 times)
How can observations of the distant universe prove that the expansion is accelerating *now*? (viewed 9102 times)
When did people discover that the Sun is a star? (viewed 9092 times)
How do unmanned space probes avoid running into things? (viewed 9000 times)
How are photons created and destroyed? (viewed 8994 times)
Could matter-anti-matter repulsion power the expansion of the universe? (viewed 8919 times)
What is the photoelectric effect? Why can't multiple low-frequency photons free an electron? (viewed 8892 times)
Do asteroids ever do anything good in the Solar System? (viewed 8851 times)
Where can I see Newton's original reflecting telescope? (viewed 8819 times)
What would happen if you went back in time and killed your grandmother? (viewed 8800 times)
What is Hot Dark Matter theory? (viewed 8638 times)
How are planets affected by the Hot Ionised Medium? (viewed 8535 times)
Do asteroids hit the sun? (viewed 8407 times)
What do meteorites tell us about life on other planets? (viewed 8401 times)
What was different on Mars in the past to allow liquid water to be present? (viewed 8388 times)
What is the relationship between the width of a star trail on a photo and the star's intensity? (viewed 8374 times)
Could neutrinos be dark matter? (viewed 8337 times)
What is "nothing", from a scientific point of view? (viewed 8276 times)
Why don't all neutron stars become pulsars? (viewed 8162 times)
What are collections of galaxies called? (viewed 8140 times)
Are there any 'lonely galaxies'? (viewed 8130 times)
Why was Mir burnt up in the atmosphere? (viewed 8049 times)
Why is it called astronomy when all the other sciences end in -ology? (viewed 8046 times)
How can we discern different galaxies/clusters along the same line of sight? (viewed 7953 times)
Why doesn't the ammonia and methane in Jupiter's atmosphere sink into the core? (viewed 7703 times)
During close approaches, can Mars appear in our sky as large as the Moon? (viewed 7696 times)
Can a human give birth in space? (viewed 7689 times)
What are the largest radio wavelengths observed from radio sources in the sky? (viewed 7399 times)
Does lunar gardening really work? (viewed 6927 times)
How do we detect incoming meteorites? (viewed 6651 times)
Is it a coincidence that we can have total solar eclipses? Are there other planets which also have them? (viewed 6391 times)
How does the color index of a star relate to its actual color? (viewed 6031 times)
Is the green flash real? (viewed 6000 times)
What is the best way to see the Milky Way? (viewed 5923 times)
Does weightlessness affect hunger? (viewed 5841 times)
Why is the sky blue and not blue & purple? (viewed 5811 times)
What color would Mars be if you were standing on it? (viewed 5809 times)
Can we make a movie of the Milky Way galaxy's rotation? (viewed 5527 times)
If the sun went out and our atmosphere froze solid, what color would it be? (viewed 5191 times)
Do constellations looks the same from space? (viewed 5030 times)
How can the universe be "flat"? We're 3D! (viewed 4719 times)
If nothing can escape a black hole, why do some black holes have jets? (viewed 4656 times)
How do we know the density of some extrasolar planets? (viewed 4567 times)
Can we harvest H & O from space to make water? (viewed 4548 times)
How big is the Hubble Ultra Deep Field image? (viewed 4267 times)
If the Universe was infinitely dense at the Big Bang, why didn't time stand still? (viewed 4230 times)
Do the Earth's magnetic poles ever change places? (viewed 4000 times)
Could the Universe's dark matter be made up of black holes? (viewed 3769 times)
What is between the Oort cloud and the closest star? (viewed 3170 times)
Did the Moon or planets form in a manner similar to that of Earth? (viewed 2576 times)
What would happen if a nuclear-powered shuttle exploded? (viewed 2364 times)
Has anyone ever seen a star "turn on"? (viewed 2037 times)
Can the sun rise from the west on Mars? (viewed 2014 times)
Are black holes spherical? (viewed 2013 times)
What would happen if a human were exposed to space without wearing a spacesuit? (viewed 1918 times)
Why don't skydivers burn up like meteors? (viewed 1722 times)
When will Hale-Bopp return? (viewed 1419 times)
Could a planetary system survive if its star merged with another, or if its star went supernova? (viewed 1417 times)
Do planets radiate noise? (viewed 1336 times)
Is it sensible to consider terraforming Mars? (viewed 1246 times)
Can we prove that the Moon isn't hollow? (viewed 1244 times)
Why are craters round? (viewed 1228 times)
How do supernovae show us that the Universe's expansion is accelerating? (viewed 1065 times)
When will humans travel to Mars and revisit the Moon? (viewed 1052 times)
When measuring the expansion of the universe, do astronomers consider that they're seeing how galaxies moved long ago, not today? (viewed 832 times)
Are there solar tides? (viewed 466 times)
Where is the Spitzer Space Telescope? (viewed 26 times)

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