Not so long ago, space itself was thought to register absolute zero, the temperature at which all atomic jiggling terminates, except for some quantum effects. Because heat is simply the movement of atoms, the coldest anything can be is when all such motion has stopped. This happens at –459.67° Fahrenheit (–273.15° Celsius), or 0 kelvin, by definition.
Since the 1960s, we've known that a 5° temperature (Fahrenheit) bathes the universe, the leftover heat from the Big Bang, usually expressed as 2.73 K. This means some morsel of warmth remains absolutely everywhere. To achieve absolute cold, you would have to not merely isolate yourself from this all-pervasive cosmic microwave background (CMB) radiation, but also find a way to suck out every bit of remaining atomic motion. Earthly laboratories using clever processes have actually attained this sort of perfect cold (to within a billionth of a degree). The coldest artificial place in the known universe actually has an address: 77 Massachusetts Avenue, Building 26-243, Cambridge, Massachusetts. That’s Wolfgang Ketterle’s lab at MIT.