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