|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
   
    | • | 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 
 |  |