Hypervelocity stars are what the name implies, stars moving at abnormally high speeds; astronomers have recently found a star traveling three times faster than normal stars. Scientists think such stars are originally in binary systems that venture too close to black holes. The black hole devours one star and slings the other out of the galaxy.
Astronomers think they can use those stars to learn about dark matter, which seems to surround galaxies. by noting the gravitational influence it exerts on them.
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