Monday, December 16, 2024

Trappist-1 b not airless

Yes, Orwell hated prose like "not uninterested"; but - bear with us. Trappist-1 is back in the science news. And not for its outer worlds: they're taking a new look at the innermost, "b".

The surface is dated to only a millennium, 1my, a thousand Earth years. That's... young, like Io young. That would imply a highly volcanic world such that its farside probably would have an atmosphere, if a highly toxic and hot one, constantly replenished.

Also possible is a hazeworld above a carbon-dioxide layer. They're thinking Eyeball-Titan, rather than Venus; hydrocarbon smog rather than acid.

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