Scientists are puzzled by the discovery of the smallest galaxy ever found, a dwarf galaxy named Segue 2, which is orbiting the Milky Way and is held together by dark matter. Scientists observed and measured the tiny galaxy using Hawaii's Keck Observatory and said the finding could offer clues to the formation of the universe. "Finding a galaxy as tiny as Segue 2 is like discovering an elephant smaller than a mouse," said study researcher and cosmologist James Bullock.

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