Venus Rotates Backwards—And Slower Than It Orbits

Venus is a planetary oddity with a rotation so slow and retrograde that it takes 243 Earth days to complete one full spin on its axis, yet only 225 days to orbit the Sun. This means a Venusian day is actually longer than its year. Even more bizarre, Venus rotates backwards compared to most planets—its axis is tilted at 177 degrees, making it spin clockwise when viewed from above the North Pole, opposite to Earth's counterclockwise rotation. Scientists believe a massive collision early in Venus's history knocked it sideways, fundamentally altering its rotation. The extreme greenhouse effect on Venus, with surface temperatures reaching 900°F (475°C), may have gradually slowed its rotation through atmospheric friction over billions of years. Adding another layer of strangeness: the Sun rises in the west and sets in the east on Venus. These peculiarities make Venus one of the most scientifically fascinating planets in our solar system, offering crucial insights into planetary formation and evolution. Understanding Venus's unusual characteristics helps astronomers predict how exoplanets might behave and how planetary atmospheres can dramatically transform a world.