a) what are the parts of a black hole?
- jets of gas, accretion disk, event horizon
b) how is gravity related to a black hole?
- it's gravity is so strong that that its escape velocity exceeds the speed of light
c) how can we see the holes if they are black?
- from its shadows, and by observing its effects on the stars and gas close to it
d) what's a Swarzschild radius?
- characteristic mass associated with every radius
e) how do Einstein's theories relate to this?
He theorized that the mass and radius of an object actually curves space-time which is why light becomes trapped in a black hole.
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