Astronomers have discovered what appear to be the 14 cool stars known in our Universe. These failed stars called brown dwarfs are so faint icy, which would be impossible to see with current telescopes of visible light.
Brown dwarfs are joining a handful of similar objects previously discovered. The new objects are at temperatures around 450 to 600 Kelvin Kelvin (from 176 to 326 degrees Celsius). The further away are colder are, therefore, in some cases, like planets around other stars.
Most new brown dwarfs found by Spitzer is believed to belong to the better known class of brown dwarfs, called T dwarfs, defined as less than about 1,500 degrees Kelvin (1,226 degrees Celsius). One of the objects seems to be so cold that even be a dwarf.
As I have said, are the stars that are on track to be planets.