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I've been saying that planets are living organisms, so like... Somehow make sense ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯

Wait, but why all planets should have a moon??? Sounds to me we ran out of interesting topics to research.

Given the Earth acquired its very large moon through a freak collision with another planet, it seems to me that inner solar system planets without moons are much more likely.

The moon creates two tidal bulges on the Earth, one towards the moon and one away from the moon. but the Earth spins faster than the Moon can go around it, so Earth's rotation drags the tidal bulges with it, the one towards the moon is slightly in front of the moon while the one away from the moon

is slightly behind the moon, but because the one towards the moon is closer to the moon, it exerts a bigger gravitational attraction, pulling the moon forwards towards the direction where the Earth is rotating, this slows down Earth's rotation and accelerates the Moon's orbit

The Moon speeding up causes it to miss the Earth by a larger margin and fall away from the Earth, and that's why the Moon is moving away from Earth by 4cm a year. But Venus spins extremely slowly, and, to make it worse: in the opposite direction to every other planet

Bit confused by the assumption that Venus definitely had a moon. Seems to be explained as "Venus is about the same size as Earth, which has a moon, so Venus should have one too". But I'm not seeing how the second part follows from the first. Isn't it possible it just never had one?