1. An event horizen is the distance, which can be represented as an imaginary sphere around the black hole. And an accretion zone is the area that the hole force gravity has an affect on.
2. Black hole is defined as a escape velocity that would have to be attained to escape from the gravational oull exerted upon an object.
Speed of light is a constant in a empty space.
Escape Velocity is the speed at which an object on the surface of a body must be propelled in order not to returnto that body under the influence of their mutual gravational attraction. It may also be defined as the speed required to propel an object on the surface of a body into a parabolic trajectory about that body.
3. A black hole is an object, typically a collapsed star, whose gravity is very strong that its escape velocity exceeds the speed of light. Since nothing is known to exceed the speed of light., nothing can escape from a black hole. they all have to deal with each other.
4. There are Stellar black holes, Supermassive black holes, and miniature black holes.
5. They thought black holes were invisible stars.
6. Because of the Hubble Space Telescope we are able to provide evidence of supermassive black holes that lurk in the center of some of our galaxies
7. The volume of the black hole is huge. Black holes have no mass.
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