NASA'S Wise Mission Discovers Coolest Class of Stars
Summary: A total of 100 brown dwarfs found so far, of which six are potential Y dwarfs (theoretized ultra-cool brown dwarfs). The coldest is WISE 1828+2650 with surface temperature of 25C! Another one, WISE 1541-2250, is located mere 9 light years away, so it could become the seventh closest known star(?) system.