The coldest temperature that isn’t natural is actually on Earth in the entire universe, that we are aware of. Experimental physicists have managed to get down to temperatures only a fraction above absolute zero 273.14K. This temperature is not predicted to be able to exist in naturally in the universe.
5,000 light years away in the Centaurus constellation, is the Boomerang Nebula, a cloud of gas being expelled from a dying star. Here, within the gas streaming outwards, astronomers have found that the temperature drops as low as half a degree above absolute zero (about -273.5°C). It is, as far as anyone knows, the coldest place in the universe, apart from the experiments run in our labs here on Earth.
Comments