What are Black Holes? The Spooky Facts You Need to Know

Black holes are among the strangest and most mysterious objects in the universe. They are invisible pits in space that have the gravitational strength of an atomic supernova packed into a sphere about the size of New York City, or roughly 20 times smaller than a red blood cell. Black holes are typically thought to be dense remnants left over after a massive star has completed its life cycle…

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