Overview
- The paper, published in The Astrophysical Journal on Sept. 14, 2026, presents suites of validated simulations that couple Venus’s spin to a satellite’s orbit under tides from the moon and the Sun.
- Across most tested cases the models produced inward migration and disruption of a moon, with modeled lifetimes ranging from about 30 million years to roughly 1.7 billion years and more massive satellites typically failing faster.
- Outcomes depend strongly on uncertain inputs: Venus’s post‑impact rotation rate, the moon’s mass and starting distance, and how Venus’s interior dissipates tidal energy, and two common tidal prescriptions give different survival windows in some scenarios.
- The simulations stop when a moon reaches the Roche limit so they do not model the detailed aftermath of disruption, and direct geological evidence would be hard to find because global resurfacing and lack of subsurface data obscure Venus’s early record.
- If correct, the result shifts blame from a rare later catastrophe to ordinary tidal evolution, has consequences for Venus’s rotation and habitability, and implies many slowly rotating, close‑in rocky exoplanets may be unable to keep large moons.