We knew about Star Latte CFBDSIR 1458 10b—a star so cold you could lick it—but NASA has now discovered an even colder star. So cold that you could wear a sweater if you were there.
The star is a brown dwarf, one of the the six classified as cool Y's. It's name is WISE 1828+2650, and it's the coldest ever discovered star at 80 degrees Fahrenheit (25 degrees Celsius). That's less than room temperature.
Sweater Star is one of the 100 brown dwarfs discovered by NASA's Wide-field Infrared Survey Explorer (WISE). The brown dwarfs begin their lives as normal stars but they can't accumulate enough mass to start ignition, remaining sad and cold in the sky. Y dwarfs are the coldest of them. [NASA]