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Scientists believe that dark matter may account for the unexplained motions of stars within galaxies. Computers play an important role in the search for dark matter information.
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I can't give you the answer but: The rate of expansion and its acceleration can be measured by observing the expansion of the galaxy with the Hubble Telescope. These measurements, along with other scientific data, have confirmed the existence of dark energy which provides an estimate of how much of this mysterious substance exists.
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