Venus could flip over from the impact of its own satellite

Unlike other planets that spin counterclockwise, it does so clockwise, as if something once turned it upside down. Recently, scientists have suggested that once it did, Venus attracted and destroyed its own moon.

The lunar influence may have caused the tides that first slowed Venus’ rotation. The frequent tides and orbital interaction resulted in the moon coming dangerously close to Venus, and the planet’s strong gravity smashed the moon to pieces.