What is a Black Hole and why do they exist?

[DARKSEID]

True its hard to have physical evidence for something that swallows all light matter and time around it and.

but on the simplest mathematical level, it's the same concept as even if nobody discovered the number four, we can still know 4 exists because if you add 2 and 2, that's what has to come out.

Mathematics is the only language many scientists have to interpret the things that go beyond our comprehension.

It's my belief that mathematics is the language of God.


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[Sweet Pea 50]

There is also photographic evidence of their existence from radiation detection satellites.

It's not even a question of IF they exist anymore.

[squealpiggy]

A black hole is a massive star that has burned off all of its helium and collapses under the force of its own gravity.

Here's something more interesting: What is a star?

A star is born from the accretion of hydrogen. In the beginning (heh heh) the hydrogen left over from the Big Bang gathered in "clumps" and because all matter has gravity and gravity is always "on" these clumps then attracted proportionately more hydrogen atoms to themselves. Under the force of gravity they gradually gather sufficient mass to collapse into a sphere (because they're spinning they're actually obliate spheroids, but I digress) and gather yet more mass. Eventually they become so massive that they begin nuclear fusion at their core.

That's what stars are, giant nuclear fusion reactors converting hydrogen into helium under the force of their own gravity. Eventually when all the hydrogen runs out the force of gravity overcomes the energy released in the fusion reaction and the star will collapse until it starts another fusion reaction turning helium into lithium, barium and carbon. At this point when the fuel runs out and the star collapses what happens depends on the mass of the star. A star of a particularly high mass (a massive star) will form a black hole, a singularity of infinite density with such strong gravity that even light cannot escape its density. A less massive star may become a relatively cool white dwarf star (they're white because they are very hot as the energy left from their billions of years of nuclear fusion gradually leaks out into space) but the bigger ones will collapse violently resulting in another set of fusion reactions and a massive explosion sending heavy elements such as iron and oxygen into space. Those heavy elements can't exist without supernova explosions so we owe our existence to exploding stars. As Carl Sagan was fond of saying, "We are all made of star stuff". Or star poo.

Black holes can also be formed by fast collisions as well as the intensity of the collision overcomes the internal pressure of the objects causing them to collapse under their own gravity. But unless the objects in collision are big enough these black holes will simply dissipate.

Tiny black holes have been created in particle accelerators.

[squealpiggy]

Fact of the matter is that reality is far more interesting than any religious superstition.

Is there a definite proof of physical existence of a black hole?

Yes.

[Derranged]

Naw, I'm just pointing out how fucking stupid you are.

That's not very nice.

[A.K.A]

That's not very nice.

or very hard.

[Trigger unhappy]

...and you're a virus to society. God needs to update his anti-virus software and delete you, then update his firewalls and ensure that nothing like you ever gets back into the system.

I'm going to use this as a Facebook status. Green k sent!

[Twako]

it's those black arses you've been rimming larry.

[D-MiZe]

There is also photographic evidence of their existence from radiation detection satellites.

It's not even a question of IF they exist anymore.

Great sig.

[Barn]

Black holes seem to be at the center of most galaxies as someone has already stated.

You can observe their gravitational impact, rather than seeing them. Obviously if black holes curve space-time enough so that even light that travels at 300 million meters per second can't escape, then it's going to have a massive gravitational pull on other stuff around it.

You can work out what radius a given mass needs to be compressed to so that it's dense enough to create a black hole, the Earth works out at about 4.5cm. This is called the Schwarzschild radius.