Solar SystemSIMULATION

Did Venus Eat Its Own Moon?

By Space.Fan Editorial DeskSeptember 20, 2026 at 6:30 PM UTC

New research suggests that Venus did not need a giant space disaster to lose its moon—it might have just pulled the moon inward until it crashed.

Image · Phys.org

The Drop

For a long time, scientists have wondered why our neighbor, Venus, is the only rocky in our inner solar system without a . Earth has one, and even smaller s like Mars have tiny ones. Some people thought a huge object must have crashed into Venus long ago to destroy any it once had. Others thought maybe Venus never had a to begin with. However, a new study suggests a different, simpler explanation. Researchers used computer models to see how gravity works between a and its . They looked at how Earth’s rotation pushes our away by about four centimeters every year. Because Earth spins fast, it gives energy to the , causing it to drift further out into space over time. Venus spins much slower than Earth. It takes the 243 days just to finish one turn. Because of this, the gravity between Venus and a potential works the opposite way. Instead of being pushed away, a orbiting Venus would lose energy and spiral inward. The computer simulations showed that if a existed, it would eventually crash into the surface of the . In every test, the result was the same regardless of how big or small the was. This suggests that even if Venus ted out with a , it could not have kept it for very long. The essentially swallowed it up, erasing any clear signs of it in the sky today.

Why It Matters

This study is important because it changes how we think about the history of our solar system. It shows that we do not always need a dramatic, catastrophic collision to explain why a looks the way it does today. Sometimes, the regular laws of gravity and the speed of a 's rotation are enough to shape its environment over millions of years. By ruling out the need for a massive impact, scientists can focus on other ways that s change. It helps us understand that even quiet, slow-moving s have complex histories that are still being written by gravity.

The Catch

This research is based on computer models, which means it describes what could have happened, but it does not prove that Venus definitely had a in the past. There is currently no direct evidence, such as craters or rocks, to confirm this happened. Because Venus had a giant surface change about a billion years ago that buried much of its old history, finding physical proof of a long-lost remains a major challenge.

Put That in Perspective

Scientists hope that future missions might look deeper beneath the surface of Venus to find signs of this ancient event. While much of the planet's history was hidden by past volcanic activity, deep seismic testing could eventually reveal if there are strange structures buried inside the planet that might be remnants of a moon that crashed into it long ago.

Source September 20, 2026

Stephen Kane

University of California - Riverside·The Astrophysical Journal