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white dwarfMailOnline
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91% Informative
A coalition of citizen-scientists with NASA 's ' Backyard Worlds : Planet 9' project were the first to spot the celestial body, the US space agency confirmed this week .
Scientists determined the mysterious object was cruising at a breakneck one million miles per hour when they spotted it more than 400 light years from Earth .
While experts have not determined what the newfound celestial body is, they speculated it is a 'brown dwarf,' a star which is larger than a planet but lacks the mass to sustain long-term nuclear fusion in its core.
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