BLACK HOLES
Firstly, the black holes aren't so black. They have colors like other stars but what made it black? think about it. Like other stars we see colors because the light from stars reaching us but in case of neutron star (black holes) the signal doesn't reaches to us. Due to high mass and infinite density the space time is highly modified or highly curved so the signal can't reaches us Therefore we see neutron star BLACK (lack of colors).
Black holes acts like dustbin made by nature in universe.
The black holes have intense gravitational field the space time is highly modified or curved due to mass of neutron star. Any signal that goes in the black hole are lost forever.At the event horizon space and time is fundamentally changed. Anything happens below the event horizon stays below the event horizon.Event horizon is the place where escape velocity reaches up to speed of light. If you want to escape the event horizon you should need to cross universal speed limit.
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