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I was going to comment that I thought 100C was the upper bound for life that relies on water, since any higher than that and it boils (although in retrospect that only happens at standard pressure). But I googled a bit and found a BBC article on the Uzon caldera in Siberia [1], which hosts microbes that can thrive up to 122C! (1000C is still far out of reach, though).

Some of these organisms also have novel ways of acquiring energy, so it seems like research like this is probably our best near bet for understanding how life can thrive in extreme conditions.

[1] http://www.bbc.com/earth/story/20160209-this-is-how-to-survi...

I would suggest that something like a virus can probably "survive" far higher temperatures (though to my knowledge none that do are isolated atm) but they would require leaving that environment (for example via the water steam) to replicate.

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