Add Yahoo as a preferred source to see more of our stories on Google. Ice covered thermometer, close-up. Absolute zero is the lowest theoretical temperature, which scientists have defined as minus 459 ...

Absolute zero is often thought to be the coldest temperature possible. But now researchers show they can achieve even lower temperatures for a strange realm of "negative temperatures." Subscribe to ...

A cloud of atoms with a temperature beyond absolute zero – which is also bizarrely hotter than any positive temperature imaginable – could be a mysterious new quantum state of matter. Luca Donini at ...