How cold are they? As cold as our bodies or cooler. You think that is not cold enough? It is very cold for a star, just compare it with our own Sun! Well, technically they belong to a star-like class of celestial bodies called brown dwarfs, believed to be failed stars. They just did not make it even though they were well on their way of becoming a star.
Reference:
http://www.nasa.gov/mission_pages/WISE/news/wise20110823.html
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