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41 votes
5 answers
3k views

How are black holes found?

35 votes
3 answers
20k views

Why does Jupiter have so many moons?

28 votes
2 answers
23k views

Why do sunspots appear dark?

27 votes
4 answers
13k views

Is there a theoretical maximum size limit for a star?

25 votes
3 answers
5k views

Why can't light escape from a black hole?

20 votes
1 answer
2k views

Have we ever observed a large meteor hit the Moon?

18 votes
2 answers
20k views

Does the Moon have any oxygen in its atmosphere?

18 votes
4 answers
395 views

Are there ways other than the collapse of a star which have been observed to form black holes?

17 votes
1 answer
433 views

How is it known that Callisto has no core?

17 votes
1 answer
303 views

What is the naming convention for newly discovered objects?

13 votes
1 answer
454 views

What is the predominant element in the dust of the Sombrero Galaxy?

12 votes
2 answers
280 views

How far apart is the dust in the Sombrero Galaxy's dust lane?

10 votes
2 answers
466 views

What is the current estimation for how much time the Sun will function properly?

8 votes
2 answers
5k views

What is the standard reference point for measuring speed?

6 votes
1 answer
101 views

Does the Perseid peak cause enough light pollution to be a problem?