On August 30th, 2011, NASA used the Wide-field Infrared Survey Explorer (WISE) to take an image of distant stars and galaxies. The green light in the middle of the image is a brown dwarf- the coldest brown dwarf currently known. Although brown dwarves start like stars with a gravitational collapse of gas and dust, they don't have enough mass to achieve the temperatures that trigger hydrogen fusion. This brown dwarf is approximately the size of Jupiter and will continue to cool and change color.
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