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NASA discovered six Y-dwarfs, the coldest stars of the brown dwarf variety, using the Wide-Field Infrared Survey Explorer in 2011. These stars lack the mass to burn for long periods and gradually cool until emitting only faint infrared light. The coolest Y dwarf, WISE 1828+2650, is 80 degrees Fahrenheit cooler than the others and is considered a “failed star.”
Using data from an infrared satellite telescope called the Wide-Field Infrared Survey Explorer, NASA announced in 2011 that it had identified six celestial bodies known as “Y-dwarfs.” Y dwarfs are the coldest stars of the brown dwarf variety, making them the coolest of all stars, even cooler than the human body. Brown dwarfs and Y dwarfs lack the mass needed to keep burning for long periods of time. They tend to gradually cool and fade, until the only light they emit is a faint glow discernible only at infrared wavelengths and invisible to the human eye.
Bodies without star power:
Scientists have determined that the coolest Y dwarf, known as WISE 1828+2650, is 80 degrees Fahrenheit (25 degrees C) cooler.
By comparison, the Sun in our solar system has a core temperature of 27 million degrees Fahrenheit. It will continue to burn for at least a few billion years.
These dwarf stars are commonly referred to as “failed stars,” too small to force atoms to fuse and release nuclear energy with the intensity typical of other stars.
