Overview
- A peer‑reviewed paper published Sept. 14–15, 2026 reports that coupled models of Venus’s spin and a hypothetical moon show tidal torques would usually drive a satellite inward until it was disrupted or hit the planet.
- The team ran wide parameter sweeps and found moon lifetimes ranging from about 30 million to 1.7 billion years depending on moon mass, starting distance and Venus’s early spin rate.
- Outcomes depend strongly on two uncertain inputs: Venus’s post‑impact rotation speed and how the planet’s interior dissipates tidal energy, with different tidal formalisms giving different survival ranges.
- Direct geological proof is unlikely because roughly 80 percent of Venus’s surface was resurfaced about 1 billion years ago, so researchers say missions such as DAVINCI+ and VERITAS and future interior probes offer the best chance to seek indirect evidence.
- The result reframes why many close‑in, slowly rotating rocky worlds may lack large moons and signals that satellite loss could affect a planet’s tilt, climate stability and assessments of exoplanet habitability.