"Jupiter...is primarily liquid, beneath a vast atmosphere; a slag of light metal compounds does float about in continent-sized pieces, but most solid material is at the core (if it can be called solid, under that pressure). The slow downdrift of matter, drawn by the gravity of the stupendous mass, releases energy; Jupiter radiates about twice what it receives from Sol, making the surface warm." (VI, pp. 67-68)
My other favourite sf writer, James Blish, coined the term, "gas giant." From this phrase and from reading Blish's They Shall Have Stars, I had gained the impression that, on a Jovoid planet, the atmosphere just became denser and denser all the way down to a super-solid core. The Wikipedia article says that most Jovian matter is in a state where there is no distinction between liquids and gasses which is an even clearer description of what I had thought.
1 comment:
I didn't know that James Blish had coined the term 'gas giant'.
I'm not sure if I first ran into it in 'They Shall Have Stars' or in a book on astronomy.
I certainly first encountered the term when I was very young, being into reading both science & science fiction from an early age.
"in a state where there is no distinction between liquids and gasses"
Ie: they are supercritical fluids.
https://en.wikipedia.org/wiki/Critical_point_(thermodynamics)
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