A brown dwarf star is an almost star. It doesn’t have enough mass to start the process of nuclear fusion in its core to become a star. The newly found brown dwarf (WISE 0855–0714) is only 7.2 light years away, making it the 4th closest star system to the sun. Since it never started fusion, it didn’t get really hot. It started out pretty hot, but without anything to keep it that way it slowly cooled. At this point it’s cooled down a lot. So much, that the ice in your freezer is probably warmer that this star. It’s temperature is -48 to -13 ºC.