A very strange object called WISE J085510.83-071442.5 lies just 7.2 light-years from the earth. Discovered by the Wide-field Infrared Survey Explorer (WISE), it is nominally one of those not-quite-planets-not-quite-stars known as a brown dwarf.
Because they are so much smaller and cooler than stars, brown dwarfs appear red and faint. But astronomer Kevin Luhman noticed that WISE J085510.83-071442.5 was very red and very faint...partly because it is small—perhaps only 2 to 10 times the mass of Jupiter—and partly because it is so cold. It's temperature, Luhman found, is only about 9° F (-13° C). That's well below the freezing point of water. In other words, the brown dwarf is literally ice cold. The fact that it is so cold is a clue to its age. If it started out at a few thousand degrees it would have taken somewhere between 1 and 10 billion years to have cooled to its present temperature. Read More at i09
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