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Most planets and other celestial bodies are stable because the Pauli force between electrons prevents atoms from collapsing into each other, while gravity, electromagnetism, and the strong force pull them together. These opposing forces create a balance which allows material bodies to retain their shape and structure. In extreme circumstances, however, if there is enough matter in a small enough space, gravity ends up winning, and the matter collapses: electrons cannot stay distant from the atomic nucleus, and incredibly dense matter forms (sometimes called neutronium).
If an even greater amount of mass is contained within the same space, even the Pauli force between nucleons cannot resist gravity and the body collapses into itself forming a black hole. In a way that can be hard to imagine, nothing can stop this collapse if enough matter gets into a small enough space, and the matter collapses to a point of zero height, width, and depth, known as a singularity. The mass in a singularity is so dense it is no longer "matter" in any real sense, but some kind of anomaly in space. Anything that gets too close to this singularity will also collapse into it the same way, whether it is matter, energy or even light itself, which is the fastest thing in the universe. The failure of even light to escape its gravitation is how this phenomenon initially acquired the name black hole.
If an even greater amount of mass is contained within the same space, even the Pauli force between nucleons cannot resist gravity and the body collapses into itself forming a black hole. In a way that can be hard to imagine, nothing can stop this collapse if enough matter gets into a small enough space, and the matter collapses to a point of zero height, width, and depth, known as a singularity. The mass in a singularity is so dense it is no longer "matter" in any real sense, but some kind of anomaly in space. Anything that gets too close to this singularity will also collapse into it the same way, whether it is matter, energy or even light itself, which is the fastest thing in the universe. The failure of even light to escape its gravitation is how this phenomenon initially acquired the name black hole.
Because matter and energy that pass this "boundary" can never escape back again, observers outside this invisible "boundary" can neither see inside nor detect what might happen within the interior—it is forever hidden from view. The invisible 'dividing line' in space where matter or energy will be unavoidably drawn into the black hole is known as the event horizon, because, like the earth's horizon, nothing can be seen beyond it.
And I have heard that blackholes dont really exist, that its a only theory. Is that true?
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