I can get that we may have created something (quark-gluon plasma) at 4 trillion degrees Celsius that is hotter than a supernova, but…
How could we have created the coldest thing ever, at 100pK (less than 1 K), and that there is nothing colder? Might a single atom in deep space not have less energy? Apparently some nebula is the coldest thing out there.
In: Physics
The bulk of the universe, the near total vacuum of Space, is at approximately 2.7K due to Cosmic Microwave Background radiation, a remnant of the early moments of the Universe (aka the Big Bang).
Everything we see in space is either a star and so is hotter, or something in space (planets, satellites, etc) that even when not warmed by a star is still “warmed” by the CMB as it’s in a +/-2.7k environment so can’t cool lower than that.
To get lower, as far as we know, you need to actively cool something in an artificial environment, which we have only observed on earth.
Latest Answers