Answered by bichon Wednesday Dec 7th 2011

a black object does not reflect light back to our eyes (which makes us 'see' an object and know that it exists).... but we know that black object exists. of course, we dont have to have something visible to know it exists... there are laws of physics which can prove the existance of matter.. or antimatter ... or does-not-matter-since-you-asked-this-question almost-4-years-ago-and-probably-have-moved-on.

Answered by Robin2868 Saturday Apr 26th 2008

Black holes can't be seen directly. But we can see the effects they have on objects and matter around them. When a black hole passes near a star or through a cloud of gas and dust, the matter "falls" into the black hole. As it falls, it heats up and gains energy. Once the matter reaches a certain temperature, it starts to give off X-rays. Because the X-rays are given off before the matter falls into the black hole, it escapes--and it can be detected.