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WISE 1828+2650 is the coldest known star at 80°F, while CFBDSIR 1458 10b is the second coolest at 200°F. These stars are brown dwarfs and too small to initiate nuclear fusion. Most visible stars rotate in binary pairs.
The coldest known star is “WISE 1828+2650,” which is about 80°F (about 24°C), making it cooler than a human body. The second-coolest star, “CFBDSIR 1458 10b,” is about 200°F (about 97°C), essentially the same temperature as a cup of coffee. To put that in perspective, most of the larger stars have a surface temperature of around 90,000 degrees Fahrenheit (about 50,000 degrees Celsius).
More Star Facts:
Stars like WISE 1828+2650 and CFBDSIR 1458 10b are often known as brown dwarfs or failed stars because they have many of the properties stars have but not enough mass to initiate nuclear fusion in their cores.
The faintest known stars are a pair of brown dwarfs. Each is about a millionth as bright as the sun.
Most visible stars actually rotate in pairs, usually with a smaller star surrounding a larger star. These are known as binary pairs and are the most common type of star relationship, although some systems have three or more stars that rotate together.
