Black hole

History of Black hole

The concept of an object from which light could not escape (e.g., black hole) was originally proposed by Pierre Simon Laplace in 1795. Using Newton's Theory of Gravity, Laplace calculated that if an object were compressed into a small enough radius, then the escape velocity of that object would be faster than the speed of light

Detect the Black Hole

There are many black holes scattered across the universe and the "reputed " astrononmical institutes have reported to have detected them ...
This report is from NASA

Using NASA's the Chandra X-ray Observatory and the European Space Agency's XMM-Newton satellite, the scientists claim to have seen space being warped, as expected. They detected bright hotspots in small regions of an energetic disk of material that swirls into the black hole, approaches the speed of light, and is superheated.

The Black Holes are scattered across the universe ..reports of it being seen in other universe was cited by astronomers
The new research looked at a galaxy called NGC 3516, which is thought to harbor a supermassive black hole in its core, which contains the mass of billions of Suns. Gas in this central region glows in X-ray radiation as it is heated to temperatures in the millions of degrees under the force of the black hole's extreme gravity.


The Making of a Black Hole

Black holes are thought to form from stars or other massive objects if and when they collapse from their own gravity to form an object whose density is infinite: in other words, a singularity. During most of a star's lifetime, nuclear fusion in the core generates electromagnetic radiation, including photons, the particles of light. This radiation exerts an outward pressure that exactly balances the inward pull of gravity caused by the star's mass.
As the nuclear fuel is exhausted, the outward forces of radiation diminish, allowing the gravitation to compress the star inward. The contraction of the core causes its temperature to rise and allows remaining nuclear material to be used as fuel. The star is saved from further collapse -- but only for a while.
Eventually, all possible nuclear fuel is used up and the core collapses. How far it collapses, into what kind of object, and at what rate, is determined by the star's final mass and the remaining outward pressure that the burnt-up nuclear residue (largely iron) can muster. If the star is sufficiently massive or compressible, it may collapse to a black hole. If it is less massive or made of stiffer material, its fate is different: it may become a white dwarf or a neutron star.

Black Holes The Good ,The Bad ..and the Ugly ...

They are not in our good Books
coz it sucks evrything in its vicinity.The gravity of a black hole is the same as the gravity of a star with the same mass. For instance, if the sun suddenly became a black hole (couldn't happen, but just for instance), Earth would continue to orbit the black sun as usual. The danger is that if you get too close to the black hole, like only a few miles away, the gravity would be extremely strong and it would be hard to escape.

This bring us to another intersting question

How close can something get to a black hole before it is sucked in? Could it suck in another black hole?

That depends on how much matter has been pulled into the black hole. The more matter, the stronger the gravity (just like everything else). It also depends on how something is moving near the hole. A planet could be in orbit around the black hole and not be pulled in. For instance, suppose the sun suddenly became a black hole (couldn't happen, but just suppose). It has the same amount of matter, so it has the same gravity. All the planets would continue to orbit it. It just would get pretty dark!!!
If a black hole were inside a cloud of gas, the gas near it would probably be pulled in. Well, since the hole then has more matter, it has more gravity. So it can pull in more gas. More gas, more gravity. Or maybe it's in a cluster of stars and some stars fall in. The hole could start growing. If there were a smaller black hole nearby, it could get pulled in too.