Venus Spins Backwards Slower Than It Orbits

Venus rotates so slowly that it takes 243 Earth days to complete one spin on its axis, but only 225 days to orbit the sun. This means a day on Venus is actually longer than its year. Even stranger, Venus rotates backwards relative to most planets in our solar system, a phenomenon called retrograde rotation. Scientists still debate why this happened. The leading theory suggests that billions of years ago, a massive collision with another planetary body knocked Venus sideways and reversed its spin. Another possibility involves the sun's gravitational pull gradually reversing the planet's rotation over time. What we know for certain is that Venus's thick atmosphere, which creates surface temperatures hot enough to melt lead, makes direct observation difficult. Radar mapping from orbiting spacecraft has been our best tool for understanding the planet's rotation. The backward spin combined with the planet's extreme atmospheric pressure creates wind patterns that circle the entire planet in just four days, much faster than the planet itself rotates. This disconnect between surface rotation and atmospheric movement remains one of the more puzzling aspects of Venus's behavior.