–
•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 3´106 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.