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dark horse carousel

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There must be more mass in the universe than meets the eye, otherwise the galaxies themselves would fly apart. Like riders on a fast-spinning carousel, the stars whirling around a galaxy are flung outward by their own inertia. Indeed, in the outer reaches of a spiral galaxy like the Milky Way, the stars travel so fast that the gravity from all the other visible matter in the galaxy can not hold them. So some other type of matter, invisible and elusive, must provide the missing mass and the extra gravity.

© 1997 by the American Association for the Advancement of Science
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bmwdrvr's avatar
very lachapelle!!