New Study Proposes Venus Swallowed Its Former Moon

A team of astrophysicists has introduced a novel solution to the enduring mystery of why Venus, the planet closest to Earth, lacks a moon: they suggest the world might have smashed into and incorporated a satellite during its early epochs.

Outlined in a new paper, the proposal relies on computer models that follow the gravitational interplay between a Venus‑mass planet and a lesser neighboring body. According to the simulations, realistic scenarios allow the planet’s thick atmosphere and intense tides to perturb the moon’s trajectory, eventually pulling it into a spiraling plunge that culminates in a violent collision.

The absence of a natural moon around Venus is a striking outlier in comparative planetology, given that the majority of terrestrial planets host at least one satellite. Mercury too is moon‑less, but its closeness to the Sun and diminutive mass render that fact less unexpected. In contrast, Venus matches Earth in size and makeup, leading researchers to question if it ever possessed a moon and, if it did, what became of it.

This latest model avoids invoking extraordinary mechanisms like a giant solar flare ripping a moon apart or an unlikely Jupiter‑induced ejection. It instead depends on conventional physics: tidal forces between a planet and its moon slowly siphon angular momentum, drawing the satellite inward. Over spans of millions of years this can lead to an impact, and the simulations indicate such a crash would have been forceful enough to wipe away obvious geological evidence on Venus’s crust.

Support for the hypothesis comes mainly from indirect clues. Radar surveys of Venus’s terrain have uncovered extensive, comparatively youthful lava plains that might align with a huge impact that re‑molded the crust. Moreover, the planet’s unusually sluggish retrograde spin—rotating opposite to most worlds—could be a residual imprint of a colossal collision that modified its rotation.

Skeptics point out that early solar‑system dynamics might have simply barred a stable moon from ever coalescing around Venus. Nonetheless, the current study contributes a persuasive element to the debate by demonstrating that, even if a satellite did arise, Venus’s distinctive conditions render its eventual disappearance feasible.

Upcoming Venus missions, including the scheduled VERITAS and EnVision orbiters, may deliver higher‑resolution observations of surface makeup and crustal depth, possibly uncovering impact marks or other evidence of a former moon. Until such data arrive, the notion that Venus may have “devoured” its moon offers a vivid narrative that helps fill a missing piece in planetary evolution theory.