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Venus may have swallowed its own ancient moon, with its own slow spin dooming any satellite to destruction, study finds

From the Newshound archive · first published 19 September 2026.

Venus may once have captured a moon, torn it apart with its gravity, and absorbed the debris — a violent cycle scientists now believe shaped the planet's history.
Venus may once have captured a moon, torn it apart with its gravity, and absorbed the debris — a violent cycle scientists now believe shaped the planet's history.

A new study published in The Astrophysical Journal suggests Venus once had a moon but its extraordinarily slow rotation — one full spin every 243 Earth days — meant tidal forces would have pulled any satellite inward rather than pushing it away. UC Riverside astrophysicist Stephen Kane ran computer simulations across a wide range of moon masses and initial spin speeds, and found virtually every scenario ended the same way: the moon spiralling toward Venus until it was torn apart and consumed. Kane said he was shocked to find no escape route across his entire range of simulations, having expected varied outcomes.

Unlike Earth's Moon, which drifts outward four centimetres a year because Earth spins fast enough to transfer energy outward, a Venusian moon would have received no such push.

Depending on Venus's starting rotation rate and the moon's mass, simulations indicate the satellite could have endured between 30 million and 1.7 billion years before being destroyed.

The debris from the collision could have crashed onto Venus, potentially reshaping its surface, atmosphere and ability to retain water — with implications for understanding moonless Venus-like planets across the galaxy.

Moreopenaccessgovernment.orgStudy reveals why Venus lacks a rocky moon: It ate itsciencedaily.comVenus may have swallowed its own moonuniversetoday.comIf Venus Had An Ancient Moon, It Was Doomedthebrighterside.newsVenus may have swallowed its own moon, new models findsndtv.comWhy Does Venus Have No Moon? Scientists May Have Solved The Mystery - ndtv.comdiscovermagazine.comVenus May Have Pulled Its Own Moon Back Toward It, Torn It Apart, and Eaten the Remainsthetimes.comWhy does Venus have no moon? Its spin would destroy one if it had - The TimesNY PostAstrophysics study suggests Venus may have swallowed its moon
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