This is the coldest place in the universe. At one degree Kelvin, the boomerang nebula is the only object ever found with temperature lower than the cosmic microwave background left over by the big bang, which is three degrees Kelvin. This place cannot physically get any colder, literally, because if it were to reach zero Kelvin, that would be absolute zero, where all molecular motion stops. Since heat is nothing more than molecular motion, and particles are either moving or they're not, the boomerang nebula is pretty much at the limit. Follow for more space content.