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Grown-up galaxy.(EARTH SCIENCE)(Brief article)
Scientists used to believe that the Milky Way Galaxy was smaller than its neighbor the Andromeda Galaxy. "The Andromeda Galaxy was called the 'big sister' and the Milky Way was the 'little sister,'" says Mark Reid, an astronomer at the Harvard-Smithsonian Center for Astrophysics. But a new study shows that the galaxies are about the same size. Galaxies are large collections of stars, gases, and dust bound together by gravity.
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