- #1
maxverywell
- 197
- 2
When a black hole is formed officially from a collapsing star (consider the simplest case of spherically symmetric collapse of non-rotating spherical star)? I see two possible answers:
1) At the moment when the radius of the star crosses the event horizon (##r_{star}=r_s##) , but the singularity hasn't (?) been formed yet (it's inside the star, at its center, so it's not a singularity yet).
2) At the moment of creation of the singularity, i.e. when whole the star has collapsed to a point.
1) At the moment when the radius of the star crosses the event horizon (##r_{star}=r_s##) , but the singularity hasn't (?) been formed yet (it's inside the star, at its center, so it's not a singularity yet).
2) At the moment of creation of the singularity, i.e. when whole the star has collapsed to a point.