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Our immediate universe is growing. A survey of the sky has found 4 new dwarf galaxies around the giant Milky Way.
Our immediate universe is growing. A survey of the sky has found 4 new dwarf galaxies around the giant Milky Way.
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Four new satellite galaxies of the Milky Way have been discovered, bringing the total known to about 20. The pace of new discoveries suggests that many more such satellites remain unknown, which would present a serious challenge to models of dark matter as "warm", fast-moving particles. The satellites are dwarf galaxies a few hundred to a few thousand light years across. The tiny galaxies are thought to be the building blocks of large galaxies, such as our own Milky Way - which is about 100,000 light years wide.