never
Black holes do not die but they can evaporate.
The most massive stars will die as black holes.
No. Black holes are the remnants left behind when the very largest stars die.
Most black holes are believed to form when very massive stars die.
While black holes give off radio waves, the fact that no light can escape, or be reflected off of, black holes makes them completely invisible to any regular light-capturing device.
Yes. When the most massive stars die, their cores collapse to form black holes.
yes
Scientists can detect black holes by using x-rays and gamma rays. Black holes still can release matter, and black holes give off a lot off x and gamma rays.
Black holes are stars (suns) that implode when they die. Making a hole that sucks up any material in space.
Dead stars are not necessarily black holes. Dead stars can become white dwarfs, neutron stars, or black holes depending on their mass. Only the most massive dead stars can collapse further to become black holes if they exceed the Chandrasekhar limit, around 1.4 times the mass of the Sun.
Black holes
Black holes do give off gravitic waves, but according to non-string theory, no a convergence of electromagnetic waves in space do not create a black hole.