Recent computer simulations conducted by astrophysicists at the University of California, Riverside, published in The Astrophysical Journal on September 14, 2026, suggest that Venus may have swallowed its own moon due to its extraordinarily slow rotation rate. Unlike Earth, where a fast 24-hour rotation pushes the moon away at a rate of 4 centimeters per year, Venus takes 243 Earth days to complete a single rotation, causing planetary gravity to draw any companion inward until it collides with the surface. Lead author Stephen Kane and his colleagues utilized physical models of gravitational interactions to demonstrate that even if Venus once formed a moon, its sluggish spin would have made moon retention impossible, resulting in a cataclysmic collision that transferred massive amounts of energy and angular momentum to the planet. The study provides a compelling mechanism to explain the current lack of moons around Venus without requiring an external catastrophic impact, offering critical insights into planetary evolution and the unique orbital dynamics of Earth-sized worlds across the universe. These findings caution astronomers searching for potentially habitable exoplanets that slow planetary rotation can lead to the destruction of moons, fundamentally altering climate and geological history, and prompting deeper seismic investigations beneath the heavily resurfaced crust of Venus.
