2024-12-05 ┃ edited ┃ RE: futurebird
@futurebird Below a third of an Earth mass or so; given that you want a surface that is warm enough for liquid water, it gets hard to simultaneously hold onto enough of an atmosphere to have enough pressure for liquid water.
Hence Mars at a tenth of an Earth mass with no current surface water that is not ice and only a brief period of its history when it did have liquid surface water.
https://mastodon.online/@michael_w_busch/113598084487009948
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