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

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

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

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NzumbeCortez
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Formula for "gravity assist"

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Mike Stone
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6 answers
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How do we know that black holes are spinning?

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ProfRob
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Identify the bright object to the left of the moon

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

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DaveTheWave
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54 votes
4 answers
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What would happen if an ice cube is left in space?

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DaveTheWave
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56 votes
6 answers
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If light has no mass, why is it affected by gravity?

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DaveTheWave
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3 answers
10k views

Can gravitational waves pass through a black hole?

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DaveTheWave
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1 answer
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Determining Stellar Activity

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ProfRob
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Convert Strain (h) to Frequency

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Shubhankar Dixit
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1 answer
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Is the universe still considered "finite but unbounded"?

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GrapefruitIsAwesome
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CMB maps analysis (Planck, ESA, FITS)

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user2820052
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