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Well, we could use the prefix "astro-" for generic celestial objects, including planets. So you could go with "astrothermal".

And then the study of those objects, cf. geology, would be.... no, wait.

(Is there a generic prefix for just planetary bodies that we should be using? If so, what is it? If not, why not?)

Lithothermal?

I like that. A nice generalisation.

That would make the study of land masses and arrangement... lithography. :-/

Why is that? They're similar conceptually but very different environments, so the distinction seems reasonable. If there were companies building geothermal equipment for Mars, it would likely have quite different requirements versus earth, right?

Do we need to change the "hydro" part of "hydraulic" when using fluids that aren't water? It's pedantry.

Areo for Ares, god of war, for those wondering. Mars is the romanized version of Ares, IIRC