specifically, "astronomers" that study black holes are called cosmologists.
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Cosmic Background Radiation
Black holes are believed to emit something called Hawking radiation.
Black holes emit a form of energy called Hawking radiation, which consists of particles being emitted from the black hole's event horizon. This radiation causes the black hole to slowly lose mass over time.
High-mass stars might become black holes, if the remaining matter (after the supernova explosion) is sufficiently large.
No. Their gravitational pull is simply too great to maintain any kind of atmosphere.
An astronomer uses telescopes to study space. They observe celestial objects like stars, planets, galaxies, and other phenomena to understand the universe's properties and behavior.
Theoretical physics scientist study how the universe was form in the first couple of trillionths of a second after the Big Bang started. Physical astronomers look at where things are in the universe, what they are made of, where they came from, and especially what are black holes, and how do things work close to one.
Astronomers and physicists.
One of the biggest problems facing astronomers is that they are Earth based and can not travel with anything besides their eyes and high powered telescopes through space to the stars and planets they study. More advances are being made every day, however, and by the time space travel becomes common our astronomers will have armed us with a wealth of knowledge.
Kind of. They go dormant if their is nothing in their surroundings to absorb. They have a constant swirling cloud of dust and gases if they are active, but they are simply a black orb if they are domant.
It is a tricky question because black holes are invisible, but scientists know that they are exist because black holes distort light, so it kind of change the light and also it sucks everything into it, so when scientists see stars starting to disappear, thats mean there is a black hole.