Black Holes -- details
Remember – gravity is same as before, away from mass
Black holes do NOT necessarily pull all nearby material in
A planet orbiting a new black hole would just keep on orbiting
as before (assuming the ejected material or radiated energy
didn’t have an effect)
Any mass can potentially be made into a black hole – if
you can compress it to a size smaller than RS = 2GM/c2
1 MSun: 3.0 km        106 MSun 3106 km          1 MEarth 8.9 mm
If you do make material fall into a black hole, material
will be falling at close to the speed of light when it
reaches RS
If that falling gas collides with and heats other gas before it
reaches RS, then light from that hot material (outside RS) can
escape.