what is a black hole?

Answer 1

A black hole is a gravitational singularity caused by imploding matter. When a supernova's core implodes, for example, it creates a volume of matter of such density that it warps space in accordance with general relativity so that its circumferenc divided by its radius approaches zero, with the radius diverging to infinity. This allows the matter to continue to implode forever (from the reference frame of an external observer). It's the ultimate free-fall, and nothing ever comes back, even light.

Answer 2

black hole is an object with a gravitational field so powerful that a region of space becomes cut off from the rest of the universe – no matter or radiation, including visible light, that has entered the region can ever escape. The lack of escaping electromagnetic radiation renders the inside of black holes (beyond the event horizon) invisible, hence the name. However, black holes can be detectable if they interact with matter, e.g. by sucking in gas from an orbiting star. The gas spirals inward, heating up to very high temperatures and emitting large amounts of light, X-rays and Gamma rays in the process while still outside of the event horizon.[1] [2] [3] Black holes are also thought to emit a weak form of thermal energy called Hawking radiation

Answer 3

A black hole is a concentration of a large mass into the smallest possible space. The mass of a giant star that was more than a million miles in diameter can become a black hole that measures no more than a few miles in diameter. The gravity created by such a dense mass can curve space around it so severely that light cannot escape it therefore it can't be seen.

Answer 4

a black hole an immense amount of matter from a giant star, many times larger than our sun, packed into a space that can't even be measured. the gravity is so intense that not even light can escape it, and the distance that happens at is called the event horizon, and is the reason that pictures of black holes are so big. now, the requirements for a spiral galaxy include having a supermassive black hole at the center.

Answer 5

An object whose gravitational pull inside a certain radius is so strong that nothing, not even light can escape it. A black hole forms when the amount of matter in the core of a star undergoing a supernova is great enough to cause a runaway gravitational collapse.

Answer 6

i blck hole.... no duh........... teehee