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Subcategories of astrophysics:
Total questions: 10053
How far do you have to travel to reach space?Popularity: 196
When a full moon occurs if there were people on the moon would they see a 'full' Earth?
Popularity: 132
What is on the other side of the universe?
Popularity: 129
What is the name for the ability of a telescope to collect radiation from a star?
Popularity: 113
Why does space exist?
Popularity: 87
What does the Milky Way galaxy consist of?
Popularity: 83
Could life that is not carbon based exist somewhere in the universe?
Popularity: 83
What the distance from Earth to the moon?
Popularity: 82
What is the weight of the Earth?
Popularity: 82
What planet in the Solar System is closest to the Earth's size?
Popularity: 81
What is the solar point of Mercury?
Popularity: 80
What three planets rotate in the opposite direction of all the other planets?
Popularity: 79
How much money does a professional astronomer earn in the United States?
Popularity: 79
Which are the anticlockwise rotations in the universe?
Popularity: 79
Do black holes really exist?
Popularity: 78
Where did the German A4 launch from?
Popularity: 78
Why do astronomers attempt to limit or make predictions as to the size of the universe?
Popularity: 77
How can you measure the diameter of the sun using only a meter- stick and a piece of cardboard?
Popularity: 77
What is beyond the universe?
Popularity: 77
When was the Milky Way galaxy discovered?
Popularity: 75
Who are UFO 'Intelligences'?
Popularity: 74
Which way does the earth rotate?
Popularity: 74
What are the names of the stars in the big dipper?
Popularity: 74
What is the point of the planet closest to the sun?
Popularity: 74
How many known planets are in the universe?
Popularity: 73
What are the primary stars in the constellation Orion?
Popularity: 73
If nothing existed before the big bang does this suggest an infinity of nothing?
Popularity: 72
What fraction of the moon is always lit?
Popularity: 72
How far have scientists seen into space?
Popularity: 71
Is it possible for something to explode in space like in the movies?
Popularity: 71
How many miles around is Earth?
Popularity: 70
When will Hale-Bopp Comet return within Earth's view?
Popularity: 70
What are black holes?
Popularity: 70
Are there black holes in space and what would happen if someone traveled into one?
Popularity: 69
How long did it take to build Sputnik?
Popularity: 67
What is beyond Pluto in the Solar System?
Popularity: 67
How old are stars?
Popularity: 66
Where is the North Star?
Popularity: 66
What and how far is a light year?
Popularity: 65
As the season progresses the time of sunrise and sunset changes but why is the change in time unequal eg sunrise may change by 2 minutes but sunset may change by only 1 minute?
Popularity: 64
How far we can go in to universe?
Popularity: 55
What are often called minor planets?
Popularity: 54
What are the names of the seven stars that are found in a constellation and never fall?
Popularity: 53
How long does a Great White Spot last?
Popularity: 53
What is a blue moon?
Popularity: 53
Who discovered that the sun was at the center of the solar system?
Popularity: 52
How much does the moon weigh?
Popularity: 52
Did physics apply just before the Big Bang?
Popularity: 51
If two bodies of mass are attracted to each other by gravitational force why don't objects stick together?
Popularity: 51
Does the universe exist in the middle of nothing?
Popularity: 51
How do you calculate how fast the Earth spins?
Popularity: 51
What would happen to Earth if there were no light?
Popularity: 50
What are various theories regarding the formation of Earth?
Popularity: 50
When was the planet Mercury discovered?
Popularity: 49
Is the universe expanding into somewhere that was already there before the Big Bang?
Popularity: 49
Why is it that the full moon appears reddish sometimes?
Popularity: 48
What would happen to Earth's climate if the tilt of its axis became less than 23.5?
Popularity: 47
How and into where is the universe expanding?
Popularity: 47
How much would a 600-pound person weigh on the moon?
Popularity: 47
Is there evidence of wind on Pluto?
Popularity: 46
What is the circumference of the moon?
Popularity: 46
What can be seen on earth from space?
Popularity: 46
What do scientists use to accurately measure the size of galaxies and black holes etc and are those methods even accurate?
Popularity: 45
What instruments are used to measure pulsar readings?
Popularity: 43
How can you become an astronomer?
Popularity: 43
Where can you download free astronomy software?
Popularity: 42
How are absorption and emission lines produced in a stellar spectrum What information might absorption lines in the spectrum of a star reveal about a cloud of cool gas lying between us and the star?
Popularity: 41
What do these letters represent O B A F G K M N?
Popularity: 41
What is the retention of heat from the sunlight called?
Popularity: 41
What are the eight planets in our solar system?
Popularity: 38
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