Cygnus X-1; Sagittarius A*
Actually, any observed black hole can be assumed to have been a star at some moment; although in the case of the supermassive black holes, it is not quite clear how they formed.
It depends on what you're studying besides black holes. If you're studying planets along with black holes, you could be an astrophysicist. Or, if you're studying atoms along with black holes, you could be a theoretical physicist. Just a few examples.
Black holes do not die but they can evaporate.
The most massive stars will die as black holes.
Ergoregion
I am not sure it is a problem. The evidence for black holes is quite strong.I am not sure it is a problem. The evidence for black holes is quite strong.I am not sure it is a problem. The evidence for black holes is quite strong.I am not sure it is a problem. The evidence for black holes is quite strong.
stellar black holes were stars (these are large)primordial black holes were pieces of the big bang (these are microscopic)
There already are black holes.
There are already black holes within the universe
It depends on what you're studying besides black holes. If you're studying planets along with black holes, you could be an astrophysicist. Or, if you're studying atoms along with black holes, you could be a theoretical physicist. Just a few examples.
No. It certainly has black holes, but it has other things as well.No. It certainly has black holes, but it has other things as well.No. It certainly has black holes, but it has other things as well.No. It certainly has black holes, but it has other things as well.
Black holes do not die but they can evaporate.
There are no black holes in our solar system
They are called "black holes".
The most massive stars will die as black holes.
Schwarzschild black holes. Named after the scientist who proved mathematically black holes can exist.
Yes black holes are moving but they have no sense of direction..
Ergoregion