This question involves the following statement in Schutz, A First Course in GR, but you don't need to have a copy to answer it.(adsbygoogle = window.adsbygoogle || []).push({});

He says that in the formation of a black hole from a supernova explosion, we should expect gravity waves of amplitude M/R, where M is the mass and R is the distance to the explosion. He goes on to say that for a black hole of 10 solar masses, whose distance is [itex]10^{23}m[/itex], this is about [itex]10^{-17}[/itex]. Since 1 solar mass is roughly [itex]10^3m[/itex], M/R for the black hole itself would be [itex]10^{-19}[/itex]. This seems to imply that it would take the supernova explosion of a star of 1000 solar masses to create a black hole of 10 solar masses. Is this correct?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Schutz, page 226 - Black hole formation

**Physics Forums | Science Articles, Homework Help, Discussion**