<i>Coldest star found no hotter than fresh coffee</i>

According to a new study, a star discovered 75 light-years away is no warmer than a freshly brewed cup of coffee.
Dubbed CFBDSIR 1458 10b, the star is what's called a brown dwarf. These oddball objects are often called failed stars, because they have starlike heat and chemical properties but don't have enough mass for the crush of gravity to ignite nuclear fusion at their cores.
With surface temperatures hovering around 97 degrees C, the newfound star is the coldest brown dwarf seen to date.
"Over the years there has been steady but slow progress in pushing the boundaries of finding the coldest stars," said study leader Michael Liu, an astronomer at the University of Hawaii.
"But with this latest discovery we have made a big leap forward besting the previous record holder by at least 150 Kelvin (150 degrees C)," he said.
With an estimated mass of only 6 to 15 times that of Jupiter, CFBDSIR 1458 10b is the smaller and dimmer member of a binary system in which two brown dwarfs are locked in close orbit.
The discovery is stretching our understanding of where to draw the line between what is a planet and what is a star, Lui added.
For instance, although surface temperatures on our solar system's Jupiter sit around -149 degrees C, astronomers have found so-called hot Jupiters orbiting other stars with surface temperatures around 538 degrees C.
"This new object may actually have an atmosphere with water clouds," Liu said.