Coming close to a black hole
Name: Honest Abe
How close can you go to a black hole without being pulled in?
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.
Jasjeet S Balga
Click here to return to the Astronomy Archives
Update: June 2012