1796. Simon Pierre LaPlace theorized that such a thing as a black hole might exist. He defined this as being able to make “largest luminous bodies in the universe [may, through this cause,] be invisible.” Turns out he was right!
Because we can’t directly see black holes, they were a hard concept to grasp at first. We could notice, however, how the surrounding stars seemed to gravitate toward empty spots with great force. After years of research, we are able to determine where black holes are based on their surrounding circumstances.
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