3 ms·
The big bang was extremely hot; the universe now is quite cold (microwave background). It was a continuous process of cooling, implying that there was an inter
by jonah-archive 4y ago
The big bang was extremely hot; the universe now is quite cold (microwave background). It was a continuous process of cooling, implying that there was an interval where the entire universe was comfortable (there are at least a few papers on this, e.g. https://arxiv.org/abs/1312.0613 https://arxiv.org/abs/1312.0613 , but I like it more just as a strange thing to thing about).
- goldenkey 4y agoComfortable but not necessarily livable?
- mikevin 4y agoI guess comfortable with regards to temperature but definitely not livable in any other regard.
- operator-name 4y agoThere's also the slightly more complex hairy ball theorem, such that a combed hairy ball will always have 2 cowlicks (or that on earth there will always be two places with exactly the same temperature, or the exactly same wind speed).