Astrophysicists Proposed Venus Consumed Its Former Moon
Researchers suggest the planet's slow rotation caused its former moon to spiral inward and crash into the surface.
Updated on Sept. 20, 2026 in Space
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A study published in The Astrophysical Journal posits that Venus likely devoured a past moon during the solar system's early history. Computer simulations from the University of California, Riverside, indicate the planet's slow rotational speed made it impossible to maintain a satellite.
Why it matters
Understanding why Venus lacks a moon helps scientists better grasp planetary formation and the gravitational dynamics that stabilize moons around planets like Earth. The theory offers a potential explanation for the distinct evolutionary path of our neighboring planet.
Venus completes a rotation in 243 Earth days, while the surface temperature reaches 880 degrees Fahrenheit. Researchers utilized computer models to simulate how gravitational forces would act on hypothetical moons surrounding the planet.
The players
University of California, Riverside
This public research university conducted the study on the orbital history of Venus published in The Astrophysical Journal.
NASA
This United States government agency is responsible for the civilian space program and plans upcoming missions to Venus.
The details
The research suggests that during the solar system's first billion years, Venus had a moon that eventually spiraled inward due to gravitational interactions. This process contrasts with Earth, where the moon recedes from the planet at a rate of 4 centimeters per year.
Timeline
In 1969, Apollo 11 astronauts placed mirrors on the moon.
Venus likely consumed its former moon during the first billion years of solar system history.
NASA plans to launch the DAVINCI+ and VERITAS missions in the late 2020s or early 2030s.
The Big Picture
This study shifts the trajectory of planetary science by proposing a new model for the missing moon of Venus, which future data from the NASA DAVINCI+ mission will help evaluate. It challenges the assumption that all terrestrial planets retain their satellites throughout the history of the solar system.
While this research focuses on planetary history, it refines our understanding of orbital stability that could eventually inform how we model space debris or future satellite placements. It helps clarify why our own Earth-Moon system is structurally unique among terrestrial worlds.
The takeaway
This study highlights the chaotic nature of early planetary development in our 4.5 billion-year-old solar system. Scientists now have a new model to explain the absence of satellites around planets with extremely slow rotation cycles.
What happens next
NASA is scheduled to launch the DAVINCI+ and VERITAS missions to study Venus in the late 2020s or early 2030s, which may provide data relevant to the moon-consumption theory.
Further reading
For more on the latest research in our solar system, explore the Space section.
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