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Milky Way enigma explained: lighter dark matter may have led to fewer satellite galaxies.
Dozens of tiny "satellite galaxies" have been observed orbiting the Milky Way, but theorists predict there should be hundreds. Now a team of astronomers offers a resolution to this conflict: Maybe dark matter, the mysterious substance making up most of the matter in the cosmos, isn't quite so dark. The researchers propose that radiation might have stirred up dark matter in the early universe, preventing the formation of satellites.
The mystery of the missing satellite galaxies has...
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