Worldbuilding fun

[Valles]

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Are they tidally locked in respect to each other, so that each world only ever sees one face of the other?
If so, there's going to be one face of each world that never has a moon in the night sky. Species exclusive to that side might well have decent night-vision.

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Yes. You'll note that their orbital and rotational periods are the same; which is why I specified species native only to the nearer sides.
Of course, for human purposes, the far sides never see each other, so it doesn't matter what kind of lighting they have.
I'm more worried about what effect the lock would have on their tectonics.
Ja, -n

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