The coldest known star is "CFBDSIR 1458 10b," which is about 200 degrees Fahrenheit (about 97 degrees Celsius) — essentially the same temperature as a cup of coffee. To put that in perspective, the previous record-holder for the coldest star was almost 500 degrees Fahrenheit (about 260 degrees C), and most larger stars have a surface temperature of about 90,000 degrees Fahrenheit (about 50,000 degrees Celsius).

More facts about stars:

• Stars such as CFBDSIR 1458 10b are often known as brown dwarfs or failed stars because they have many properties that stars have but not enough mass to start nuclear fusion in their cores.


• The dimmest known stars are a pair of brown dwarfs. Each is about one-millionth as bright as the sun.


• Most of the visible stars are actually revolving in pairs, usually with one smaller star circling a bigger star. These are known as binary pairs and are the most common type of star relationship, though some systems have three or more stars revolving together.

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