A- Well you have the jets of hot gas, the accretion disk, and the event horizon
B- The gravity of a black hole is so strong that not even the speed of light can escape it. Like in order to escape earths gravitational pull you must be going 11km/s. So if you get to close to a black hole your are plum outta luck unless you have some miracle rocket ship that goes faster then the speed of light.
C- Well it cannot be seen regularly and is very hard to find. We normally find them through the effect they have on stars and gas around them.
D- The radius for a given mass where, if that mass could be compressed to fit within that radius, no known force or degeneracy pressure could stop it from continuing to collapse into a gravitational singularity.
E- Well Mr. Smarty Pants Einstien thought of space and time as a fabric. And black holes are thought of to be rips in the fabric that is space and time.
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