Archive · 15 Sep 2026
Scientists Suggest Venus May Have Destroyed Its Own Moon
Scientists are trying to explain why Venus does not have a moon.
They suggest Venus may once have had one.
Venus spins very slowly, taking 243 Earth days to rotate once.
This slow spin could have pulled the moon closer to Venus.
Eventually, the moon may have crashed into the planet.
Computer simulations produced this result for moons of different sizes.
Older ideas said Venus might never have had a moon or that a large impact destroyed it.
Learning how Venus became so different from Earth may help scientists understand planetary climates.
A University of California, Riverside study suggests Venus may once have had a moon that spiralled into the planet.
Researchers say Venus’s exceptionally slow rotation would have pulled a hypothetical moon inward rather than pushing it away.
Computer simulations indicated that moons of various sizes could have collided with Venus within the Solar System’s first billion years.
The theory differs from earlier explanations that Venus either never had a moon or lost one in a massive impact.
Researchers say studying Venus’s divergence from Earth could provide clues about long-term climate change on Earth.
- Who
- Researchers at the University of California, Riverside, led by astrophysicist Stephen Krane.
- What
- They proposed that Venus may have swallowed a former moon after the moon spiralled inward and collided with the planet.
- When
- The study was published in The Astrophysical Journal and presented this week; the proposed collision would have occurred within the Solar System’s first billion years.
- Where
- The proposed collision occurred at Venus; the research was conducted by University of California, Riverside researchers.
- Why
- Venus’s unusually slow rotation may have caused gravitational effects that pulled a moon inward instead of allowing it to move away.
New Moon-Destruction Theory
Earlier Explanations
Why Venus lacks a moon
New Moon-Destruction Theory
The researchers argue that Venus likely had a moon, but its slow rotation caused the moon to spiral inward and collide with the planet.
Earlier Explanations
Earlier explanations proposed that Venus never captured a moon or that a moon was destroyed in a massive impact.
Role of planetary rotation
New Moon-Destruction Theory
The study says Venus’s 243-day rotation would pull a moon inward, unlike Earth’s faster rotation, which gradually pushes its moon outward.
Earlier Explanations
The earlier explanations did not identify Venus’s slow rotation as the primary reason for the planet’s moonless state.
- Study source
- The Astrophysical Journal
- Research institution
- University of California, Riverside
- Lead author
- Stephen Krane
- Venus’s rotation
- 243 Earth days per rotation
- Proposed timing
- Within the Solar System’s first billion years
- Earth’s lunar drift
- About 4 centimetres per year outward
- Venus surface temperature
- Up to 880°F (471°C), according to the article