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Astronomy

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    $\begingroup$ This is a useful answer - at very low pressures (below about 0.006 atmospheres), only the solid and gas phases of water exist. So even in our own solar system, in the space between Earth and Venus for example, the equilibrium temperature is between 0 and 100 C, but liquid water cannot exist there because of the low pressure. $\endgroup$
    – Eric Jensen
    Commented Apr 14, 2021 at 1:14
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    $\begingroup$ Okay, so not 15 million years after Big Bang. Was there at some earlier point a combination of pressure and temperature to permit liquid water? I think it would make the answer much better if you can answer that too! $\endgroup$
    – Daniel Darabos
    Commented Apr 14, 2021 at 12:57
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    $\begingroup$ @DanielDarabos It seems by implication that the answer is no... if the temperature was 3000K at 370k years at 10E-17 atmospheres at it would seem both temperature and pressure could only drop from that point, the pressure is already too low while the temperature is still way too high. $\endgroup$
    – Michael
    Commented Apr 14, 2021 at 21:34
  • $\begingroup$ Awesome explanation, thanks! $\endgroup$
    – Daniel Darabos
    Commented Apr 14, 2021 at 22:10
  • $\begingroup$ A somewhat literal take on "The Mists of Time" here! $\endgroup$
    – Rowan
    Commented Apr 15, 2021 at 12:06