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Vera Rubin Didn't Discover Dark Matter Rubin and her collaborator, Kent Ford, discovered that M31, the Andromeda Galaxy, was spinning in an unexpected way. Credit: NASA/JPL-Caltech via Wikimedia Commons.
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Cheetah population plummeting toward extinction A couple of cheetahs are photographed Aug. 22, 2012, in the Tamboti Game Reserve, near Lephalale, South Africa. Conservationists are sounding alarm bells for the cheetah, the fastest animal on land.
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