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Scientific American

Zippy Star Promises To Be Relativity Laboratory

5 Oct 2012, 23:19 UTC
Zippy Star Promises To Be Relativity Laboratory
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At the heart of our galaxy is a giant black hole, four million times as massive as the sun. How do we know? One important piece of evidence comes from studies of stars in the galactic center. Several stars loop around the inner galaxy in a high-velocity swarm. And their orbits betray the presence of a gigantic black hole at the core of that swarm exerting the pull of gravity on those stars. [More]

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