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How did they know about the black hole? observations
History of black hole discovery
Black Hole is an infinitely small point?
One that failed to become Black hole, becomes white dwraf or neutron star
Heating of particleswhen entering
A black hole is a star that had ran out of fuel, a totally black object billions of light years away. It had only been in the recent years when human discovered about it. It is an object of extreme density and a strong gravitation field, but with this gravitational field, it "sucks" everything in. Nothing can escape, not even light. That's why it appears totally black. It is a mysterious object in space that human suspects it exists, but still, there's no great evidence of its existence until only lately in the year 2000…
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