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Dark-Matter Galaxy Detected Sunday, January 16, 2011 - Anuradha Menon Home >> Headlines >> Space   
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An entire galaxy may be lurking, unseen, just outside our own, scientists announced Thursday. The invisibility of "Galaxy X"—as the purported body has been dubbed—may be due less to its apparent status as a dwarf galaxy than to its murky location and its overwhelming amount of dark matter, astronomer Sukanya Chakrabarti speculates. Detectable only by the effects of its gravitational pull, dark matter is an invisible material that scientists think makes up more than 80 percent of the mass. (source: news.nationalgeographic.com)
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