Stars as cool as the human body found by NASA’s Wide-field Infrared Survey Explorer offer astronomers the chance to study star formation and the atmospheres of planets like Jupiter, away from the light of more dazzling stars. The WISE satellite, decommissioned this year, returned data revealing 100 new brown dwarfs, sometimes termed “failed” stars. Six of these are classified as cool Y’s. Y dwarfs are the dimmest stars of the brown dwarf family, like all brown dwarfs, they are not massive enough to fuse atoms at their cores. Without the atomic energy that allows stars like our sun to burn for billions of years, brown dwarfs gradually cool, until they only emit infrared light. One of the Y dwarfs found, WISE 1828+2650, now holds the record for chilliest star at 80 degrees Farenheit. full article here.