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Fraser
2013-Dec-13, 07:30 PM
When it’s a brown dwarf — but where do we draw the line? Often called “failed stars,” brown dwarfs are curious cosmic creatures. They’re like swollen, super-dense Jupiters, containing huge amounts of matter yet not quite enough to begin fusing hydrogen in their cores. Still, there has to be some sort of specific tipping point, […]

More... (http://www.universetoday.com/107141/when-is-a-star-not-a-star/)