Black Hole is a big concentration of mass that make a very large gravity area. Because of it,nothing could escape from it gravitional area. Need speed of light to escape from it. Black hole come from the star evolution's .Actualy the last step of star evolution. Black Hole comes from main sequence stars,but has mass 8 times than the sun.
First,the star will become supernova cause of it explosion (the star).This explosion created as the gravitonal colappse. The star couldn't produce energy from fussion reaction again.The star will become unstable,then the star shrink.After that, the star will explode. Throw out its atmosphere and its materials. The star will become brighter than before. We call this supernova. In the next step of its evolution,if the star mass 25 times than the sun,it will become the black hole,if lower,it will become neutron star.
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| An illustration of black hole |
HAVE BLACK HOLES BEEN OBSERVED?
Because of its gravity power,nothing could escape,include light can't escape than it. Light just could enter the black hole,but couldn't escape through it So,we couldn't observe the blackhole because it absorb light
HOW COULD WE KNOW THERE IS BLACK HOLE???
In earlier astronomer has predicted that there is a black hole.Albert Enstein is the one from the astronomers.After he found his gravity theory,he predicted it.It still became a controversy a that time. Nowaday,we could prove the black hole through X-ray Telescope.The emission of black hole is X-ray wave.If some place in space that radiate so many X-ray wave,it means there is a black hole in there.
IS THERE ANY BLACK HOLE NEAR THE EARTH???
The answer is no. Why?Because to become a blaca star must have 8times mass of sun. The kind of that star commonly placed near the core of galaxy.And the distance from us is very far. Our solar system placed about 30.000light years from the core.
WHAT IS ON THE CORE OF OUR GALAXY???
A super massive black hole. The astronomer estimated there is a supermassive black hole on the core of our galaxy,in same case for other galaxy.A galaxy could rotate because there is a super massive black hole on the core of galaxy.
SOURCE : http://en.wikipedia.org/wiki/Black_hole
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