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Home This artist’s conception portrays a free-floating brown dwarf, or failed star. (Image credit: NASA/JPL-Caltech) This artist's conception portrays a free-floating brown dwarf, or failed star. (Image credit: NASA/JPL-Caltech)

This artist’s conception portrays a free-floating brown dwarf, or failed star. (Image credit: NASA/JPL-Caltech)

This artist's conception portrays a free-floating brown dwarf, or failed star. (Image credit: NASA/JPL-Caltech)

This artist’s conception portrays a free-floating brown dwarf, or failed star. (Image credit: NASA/JPL-Caltech)

The locations of brown dwarfs discovered by NASA’s Wide-field Infrared Survey Explorer, or WISE, and mapped by NASA’s Spitzer Space Telescope, are shown in this diagram. The view is from a vantage point about 100 light-years away from the sun, looking back toward the constellation Orion. (Image credit: NASA/JPL-Caltech)