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fuer_den_Kaiser t1_j4z1vo2 wrote

In theory, yes. We have discovered from binary asteroids to binary stars so binary planets are physically possible. However; if the separation between them is too close tidal friction could become an issue, making them lose momentum over time resulting collision between the two.

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aspheric_cow t1_j4zvast wrote

If they are tidally locked, there won't be any tidal friction, would there?

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fuer_den_Kaiser t1_j54n20b wrote

I don't think so, if I remember correctly only the orbital distance and eccentricity affects tidal friction. Synchronous orbit aka tidal locking doesn't change anything mentioned above.

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aspheric_cow t1_j550grg wrote

Tidal friction is caused by the planet's rotation. The tidal force deform the planet, and the rotation drags the deformed shape to be misaligned with the moon.

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