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7 votes
2 answers
327 views

From an outsider's perspective, how can a black hole grow if nothing ever crosses the event horizon?

0 votes
2 answers
341 views

What would happen to the Galilean moons and Titan if Jupiter and Saturn disappeared?

0 votes
0 answers
11 views

Is there a easy way to read a star map and discover when and where it was seen and recorded?

1 vote
0 answers
68 views

Formula for "gravity assist"

42 votes
6 answers
6k views

How do we know that black holes are spinning?

1 vote
1 answer
55 views

Identify the bright object to the left of the moon

64 votes
2 answers
14k views

If two black hole event horizons overlap (touch) can they ever separate again?

54 votes
4 answers
17k views

What would happen if an ice cube is left in space?

56 votes
6 answers
24k views

If light has no mass, why is it affected by gravity?

76 votes
3 answers
10k views

Can gravitational waves pass through a black hole?

0 votes
1 answer
25 views

Determining Stellar Activity

0 votes
0 answers
56 views

Convert Strain (h) to Frequency

-1 votes
1 answer
54 views

Is the universe still considered "finite but unbounded"?

1 vote
0 answers
23 views

CMB maps analysis (Planck, ESA, FITS)

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