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A comment on Freshly made plutonium from outer space found on ocean floor. Parent comment

Re:Freshly made plutonium from outer space found on ocean floor by Retric on Friday May 14, 2021 @07:16AM (#27153004)
In Astronomy STP is the exception not the rule. Not much is a gas at 3 kelvin in deep space, the other common option is stars where everything is a plasma. And that’s ignoring white dwarf’s which are mostly electron-degenerate matter, neutron stars which don’t have chemical elements, and black holes which are even stranger.

So, really hydrogen, helium, and everything else is a perfectly reasonable classification as everything else acts the same outside of fusion.

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Re:Freshly made plutonium from outer space found on ocean floor by enkid on Friday May 14, 2021 @09:04AM (#27153799)
What is the typical state of matter at 3 kelvin in deep space?
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Re:Freshly made plutonium from outer space found on ocean floor by Sharlin on Friday May 14, 2021 @10:32AM (#27154741)
Most matter in deep space is individual ions, atoms, or molecules, so has no well-defined phase. Then there's solid dust particles which are made of all sorts of stuff including silicates, organic compounds, and ices of different elements.
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Re:Freshly made plutonium from outer space found on ocean floor by eloff on Friday May 14, 2021 @09:22AM (#27153993)
Solid. Everything except hydrogen and helium would be in a solid state I think.
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Re:Freshly made plutonium from outer space found on ocean floor by evanb on Friday May 14, 2021 @11:05AM (#27155056)
That’s not obvious because of the ultra low pressure.
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Re:Freshly made plutonium from outer space found on ocean floor by bigyikes on Friday May 14, 2021 @11:33AM (#27155348)
Agreed. I haven’t thought about this stuff since taking gen chem in college, so I went and looked up the phase diagram for Neon, as an example.

At low pressures, it looks like as little as 15 Kelvin is enough to make Neon a gas.

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Re:Freshly made plutonium from outer space found on ocean floor by Retric on Saturday May 15, 2021 @07:15PM (#27169814)
However, deep space is 2.7 Kelvin. Though of course it gets much hotter near stars and even simply being inside a galaxy is enough to hit 10-20 Kelvin.
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Re:Freshly made plutonium from outer space found on ocean floor by vagrantJin on Friday May 14, 2021 @02:44PM (#27158173)
Does this include the noble gases?
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Re:Freshly made plutonium from outer space found on ocean floor by Retric on Friday May 14, 2021 @02:59PM (#27158361)
Yes, though noble gases can actually form molecules in space. https://phys.org/news/2013-12-noble-gas-molecules-space.html
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