this post was submitted on 23 Apr 2026
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My guess is that a rocky planet that is 5% - 95% covered with ocean is probably pretty rare. You probably mostly either get water / ice planets or rock planets.
Another thing that makes Earth unique is the liquid iron core. Without that you don't get a magnetic field. Without a magnetic field, it's hard to keep the atmosphere intact. That means that water vapour gets blown off over time, which eventually results on a dry planet like Mars.
As for all 3 states of water, as long as you're in the range to have a wet surface, you'll probably get all 3 states of water. The poles will get a lot less solar radiation than the equator, so if the equator is wet it's pretty likely that you'll get at least a bit of ice at the poles. If there's a lot of water then it's easy to get water vapour. Even Europa which has an average surface temperature of -171C (102K) has a liquid water ocean under the icy surface, and although its atmosphere is extremely thin, part of it is water vapour.