Question:
How close can you go to a black hole without being pulled in?

Replies:
If M is the mass of the black hole then you can come back from a close
encounter with a black hole if you stay at distances larger than
(2GM/(c^2)). Here G is the universal constant of gravitation, c is the
velocity of light. This assumes that you are a point particle, for extended
bodies, tidal forces can lead to disruption much before this distance.

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