We used to think that the stars, even extinct, called brown dwarfs, very hot. But these ideas are collapsing recently discovered brown dwarf room temperature.
Like normal stars, brown dwarfs are formed from gas clouds, but they do not have enough mass to sustain stable nuclear reactions. Short period of time, they are red, from the remaining heat after their formation, and then go out. But even the coldest known brown dwarfs are hot enough - they fry anyone who tries to approach them too closely.
Kevin Luhman of Pennsylvania State University, with the help of NASA’s Spitzer infrared telescope, discovered the radiance of a brown dwarf, whose temperature is 30