One of the most startling discoveries about space in the last century was the existence of black holes. Black Holes are points in space where gravity is so powerful it sucks in everything, even light. We cannot see the black hole because light cannot escape from it. Black holes may form when a huge star burns out and is squeezed so tightly by it's own gravity that all its matter is crushed to a tiny point-called a singularity-before vanishing completely.
Image what happens if a black hole forms near our earth!!
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