Why does Venus spin so slowly?
Quick Answer
Venus rotates very slowly because its spin was probably altered over time by strong solar tides and maybe giant impacts. One Venus day lasts about 243 Earth days.
The Full Story
Venus is unusual because it turns on its axis extremely slowly, taking about 243 Earth days for one rotation. Scientists think its current spin may be the result of a mix of early collisions, tidal forces from the Sun, and long-term atmospheric effects. Venus's thick atmosphere may also interact with the rocky surface in ways that help maintain its unusual rotation. The planet also spins backwards relative to most planets, meaning the Sun appears to rise in the west there. Its slow and retrograde rotation make Venus one of the strangest worlds in the inner Solar System.
Key Facts
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Suggested video title for this topic:
"A day on Venus is longer than its year — here’s why!"
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