Monday, December 11, 2017

How big is a supermassive black hole?

Lurking at the center of the Milky Way galaxy is the supermassive black hole Sagittarius A*, a monstrous clump of matter so dense that the pull of its gravity overpowers anything that comes near it, including light itself. But it’s hard to grasp just how big a supermassive black hole is because there is nothing much out there to match it.

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