lot more to be done there. I've read some of the literature on formation of Jupiter and Saturn moons, but I wonder if there is work out there on whether you can form, say, Mars-size/gravity rocky moons around gas giants. Ideally Earth size, but Mars might do, at least for a while.

but Arnscheidt and Wordsworth modified that conclusion, showing instead that such low gravity bodies would develop very extended water vapour atmospheres that are subject to cometary-like ablation. (The original line of thinking arose from an offhand remark in my textbook). There's a

A key question about habitable moons #exoplanets is whether giant planets could have large, rocky moons. The moons of Saturn or Jupiter have too low gravity to hold onto water, if you heat them up to liquid water temperature. I argued they'd go into a runaway greenhouse,

Dust devil.

On Mars.

Photographed today.