Venus may have once possessed a natural moon that eventually crashed into the planet, according to researchers. Astrophysicists at the University of California, Riverside, led by Dr. Stephen Kane, used advanced gravitational computer simulations to investigate the mystery. Published in The Astrophysical Journal, the study suggests Venus’ exceptionally slow rotation gradually pulled its satellite inward, ultimately causing it to collide with the planet’s surface billions of years ago.

The fundamental distinction lies in planetary rotation speeds. Earth completes a full rotation every 24 hours, transferring rotational energy to push our Moon gradually outward. Conversely, Venus takes 243 Earth days to complete a single axial turn. This sluggish spin created strong tidal friction, drawing any surrounding orbital debris or captured moons closer until complete collision occurred within the solar system’s first billion years.

How Can Venus Help Explain Moonless Exoplanets?

Previous theories suggested Venus never experienced a moon-forming impact or lost its moon to a subsequent catastrophic asteroid strike. Kane’s tidal demise model proves that standard gravitational dynamics alone prevent slow-spinning planets from retaining moons over geological timescales. Furthermore, astronomers can apply these findings when evaluating slow-spinning Earth-sized exoplanets orbiting distant stars, refining criteria for habitable planetary systems.

Upcoming exploration missions, including NASA’s DAVINCI+ and VERITAS probes, aim to analyze Venusian atmospheric gases and surface structures to detect ancient impact remnants.