Coldest – Boomerang Nebula 1K The coldest place outside of a laboratory is the Boomerang Nebula at 1K or minus 272.15°C, which is even colder than the Universe’s background temperature of 2.7K. Hottest – Colliding particles in Large Hadron Collider 1000000000000000000K When particles collide in the soon-to-open Large Hadron Collider they will reach a temperature … Continue reading Coldest to hottest