Astrophysicists Proposed Venus Consumed Its Former Moon
New modeling suggests Venus's slow rotation caused a previous satellite to spiral into the planet.
Updated on Sept. 20, 2026 in Space
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Researchers at the University of California, Riverside, published a study in The Astrophysical Journal proposing that Venus consumed a former moon. The findings suggest the planet's slow rotational speed destabilized the satellite's orbit early in the solar system's history.
Why it matters
Understanding why Venus currently lacks a moon provides insight into how planetary rotation influences long-term orbital stability. This research sheds light on the gravitational dynamics that shaped the solar system approximately 4.5 billion years ago.
Venus takes 243 Earth days to rotate, creating a dynamic where any potential satellite would lose orbital stability. In contrast, the Moon recedes from Earth at 4 centimeters per year, a process observed via mirrors placed on the lunar surface during the 1969 Apollo 11 mission.
The players
University of California, Riverside
A public research university known for its work in astrophysics and planetary science.
NASA
The United States government agency responsible for the civilian space program and aeronautics research.
The details
Researchers used computer models to simulate the gravitational mechanics of hypothetical moons orbiting Venus. The simulation indicates that due to Venus's extreme 243-day rotation period, tidal forces would have dragged a moon inward rather than pushing it outward, causing it to impact the planet. Venus currently maintains surface temperatures of 880 degrees Fahrenheit, which complicates direct geological evidence of such an event.
Timeline
1969: Apollo 11 astronauts placed mirrors on the moon.
First billion years of solar system history: Venus likely consumed its former moon.
Late 2020s or early 2030s: NASA plans to launch DAVINCI+ and VERITAS missions.
The Tech Race
This research establishes a new theoretical baseline for Venusian orbital history that upcoming missions aim to investigate. NASA plans to launch both the DAVINCI+ and VERITAS missions in the late 2020s or early 2030s to gather new data on the planet's evolution.
While this study changes our understanding of the solar system's history, it does not impact current space technology or consumer workflows. Researchers and space enthusiasts should monitor updates from the upcoming NASA DAVINCI+ and VERITAS missions for new data on Venusian characteristics.
The takeaway
The research suggests that rotational speed is a primary determinant of a planet's ability to maintain a satellite over billions of years. Readers can watch for data releases from NASA's upcoming Venus missions in the late 2020s or early 2030s to confirm if evidence of this impact remains.
Further reading
For more on the current understanding of planetary systems, visit Space.
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