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A blaze of X-rays from the center of our galaxy is the burp following a gargantuan (and rather messy) cosmic feast, astronomers reported in February: A massive black hole there devoured something the size of the planet Mercury, and in the process, let loose an outburst so intense that we still see the echoes six decades later.
When matter falls into a black hole, it grows hot and glows brilliantly before vanishing into oblivion. These days the Milky Way’s central black hole, called Sagittarius
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