black holes The black hole we see is the Event Horizon. Its realy not a hole. Just a spherical region in space where matter ceases to exist.
They are called "black holes".
Black holes are generally categorized into three buckets - the largest being called supermassive, the 'medium' being associated with stellar evolution and called 'stellar mass' black holes, and the smallest or tiny ones called "microscopic" black holes.
specifically, "astronomers" that study black holes are called cosmologists.
The energy that comes from black holes is called Hawking radiation.
there two different things
These are called sun spots.
It isn't known whether micro black holes - usually called primordial black holes - exist at all. If they do exist, they can be at any random location of space.
It is called Black Holes and Revelations
Not really "a" black hole - many black holes. It is currently believed that all, or most, galaxies have a huge black hole at its center. Any galaxy should also have lots of smaller black holes - so-called "stellar" black holes, because they have approximately the mass of a star (larger stars can become black holes).
They're still called black holes. A black hole remains defined as a black hole as long as it absorb everything near them, both energy and matter, including gas.
The density of matter just after the big bang is calculated to be sufficient to have spontaneously created black holes; such are called primordial black holes, and searches for their existence are ongoing.
black holes The black hole we see is the Event Horizon. Its realy not a hole. Just a spherical region in space where matter ceases to exist.