Atoms and subatomic particles vibrate and move around when they’re hot. The hotter they are, the faster they move. The colder they are, the slower they move. In fact, at absolute zero all movements from the atoms completely stops. You can’t get colder than that. It’s like trying to go South from the South Pole, or North from the North Pole. Not only won’t it happen, it can’t.
Below is an infographic that details the hottest things (or moments) in the known universe. Of course, a keyword here is "known." We obviously haven't discovered everything in the universe (or even a fraction of anything, really). So the below graphic is just an overview of the things that we do know about. It was created by Column Five Media for Rasmussen College.