Planet and singularity

  • #1
202
0

Main Question or Discussion Point

Why does physicist only talk about gravity collpase on stars?

Doesn't gravity collapse happen to planets? I mean they do not have any process such as nuclear fusion do repell gravity.
 

Answers and Replies

  • #2
196
0
I would imagine the mass of planets is much too small. After all, gravity is a very weak force.
 
  • #3
jcsd
Science Advisor
Gold Member
2,090
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Tail is correct, the mass of a planet is far, far too small for gravitational collapse to occur IIRC the minimum mass of a star (befiore going supernova) needed to create a black hole is thought to be in the region of 20-40 solar masses (i.e. 20-40 times the mass of our sun).
 

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