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from this graph, it looks like it should be around 20000km from the center. So it is about 0.8 radius.

However, I cannot imagine this is correct. The pressure is probably only a few bar at that height. And it is mainly hydrogen. How can the hydrogen at this pressure has density of 1g/cm^3? Even considering the low temperature it has there, it is still impossible.

Can anyone explain this to me?

Wang
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    Why do you say "only a few bar". This graph would suggest a pressure of about 400 bar at that depth https://www.researchgate.net/figure/Uranus-and-Neptune-pressure-profiles-as-a-function-of-normalized-radius_fig3_231059682 – James K Oct 15 '23 at 18:32
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    Why don't you follow the links in the image description? They link to papers who model it. The arxiv.org versions are freely accessible – planetmaker Oct 16 '23 at 05:52
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    I’m voting to close this question because the OP just appears to disagree with published data for no apparent reason. – Rory Alsop Oct 16 '23 at 08:04
  • @JamesK thanks, my bad, somehow i miss read the axes of the pressure vs radius in another paper – Wang Oct 18 '23 at 09:39

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