Why do Venus and Uranus spin the way they do?
Quick Answer
Venus rotates very slowly and backward, while Uranus is tilted almost on its side, because major impacts and gravitational evolution likely altered their original spin states. These are not simple, one-time textbook examples of rotation.
The Full Story
Planetary rotation can be reshaped by giant collisions, tidal interactions, and long-term gravitational torques. Venus rotates retrograde and extremely slowly, taking about 243 Earth days to complete one turn, and scientists think a mix of impacts and atmospheric tides may have influenced its present state. Uranus is tilted by about 98 degrees, so it effectively rolls around the Sun on its side, likely due to one or more massive impacts early in its history. These unusual spins remind us that planetary systems are dynamic, not fixed after formation.
Key Facts
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"Why do some planets spin backwards or lie on their side?"
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