Astronomy
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zephyr
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194 Answers

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76 votes
Accepted

Is it possible to achieve a stable "selenostationary" orbit around the Moon?

55 votes

Where did TRAPPIST-1a go?

42 votes
Accepted

Can a tectonically inactive planet retain a long-term atmosphere?

38 votes
Accepted

Why didn't the Big Bang produce heavier elements?

33 votes
Accepted

Is the universe considered to be flat?

31 votes
Accepted

Maximum spin rate of a black hole?

29 votes
Accepted

Why don't we see "the milky way" in both directions?

25 votes
Accepted

Explosions of black holes

24 votes

Where did the Sun get hydrogen to work with if it is in the 3rd generation of stars?

23 votes

Is it possible that a star is the center of a galaxy?

23 votes

Did the earth form outside the solar system?

21 votes
Accepted

Why do aliens have to be carbon based lifeforms?

19 votes
Accepted

Is there a gas giant orbiting TRAPPIST-1?

18 votes
Accepted

Are the planets Trappist-1 in the solar system?

17 votes
Accepted

Why is Enceladus's albedo greater than 1?

17 votes
Accepted

What is the Galactic Latitude and Galactic Longitude? How is different from the latitude and longitude we use on Earth?

15 votes

Why do certain moons have their rotational period equal to their orbital period?

14 votes
Accepted

What does forward modeling mean?

12 votes

Why is gravity only an attractive force?

12 votes
Accepted

Does the Sun have any atmosphere?

12 votes

Can the difference between a star and a galaxy which are point sources be detected?

11 votes

What does it mean for a proto-neutron star to be opaque to neutrinos?

11 votes
Accepted

Does the age of the universe take into account General Relativity / Special Relativity?

11 votes
Accepted

Why does the Moon's terminator look "wrong" in this image?

11 votes
Accepted

Why "Dark matter" is still considered?

11 votes
Accepted

How does the Hubble telescope capture long-exposure photos?

11 votes
Accepted

Do astronomers generally agree that the distinction between comets and asteroids is not so clear?

10 votes
Accepted

If there was air between the Sun and Earth, how warm would we get?

10 votes

How do we know how the Sun (or any star, for that matter) will evolve?

10 votes
Accepted

How was the first exoplanet detected?

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