Venus Rotation Study Reveals New Insights
A new study presented at the European Geosciences Union General Assembly in Vienna offers an explanation for Venus’s peculiar rotation. Researchers suggest that a Moon-sized object struck the planet at a steep angle during its first 50 million years, causing its current 248-day spin. The impact likely melted about 99% of Venus’s mantle, which may have drastically altered its rotational dynamics.
Extreme Conditions on Venus
Venus’s surface temperature reaches 467 °C, and its atmospheric pressure is 92 times greater than Earth’s. The planet rotates retrograde, meaning clockwise. The impacting object was roughly ten times less massive than Venus itself. Simulations show that such giant collisions generate surface magma oceans, with melt layers ranging from 100 kilometers deep to a fully molten mantle.
Cédric Gillmann, one of the researchers, stated:
“We wanted to explore whether a collision could have altered the planet’s rotation.”He added,
“It would have needed to be a high-angle impact to significantly change the planet’s initial spin.”Gillmann also noted that scientists are trying to 'match the initial rotation condition of Venus, which later evolves into the slow rotation we observe today.'
The researchers also discuss potential transfer of organic material from Earth to Venus. At the 2026 LPSC conference, scientists from Johns Hopkins University and Sandia Laboratories presented a material transfer model suggesting that about 20 billion cells may have been transported to Venus over the last billion years. Roughly 100 Earth cells disperse into Venus’s atmosphere each year.
“Essentially, we throw a large rock into another very large rock and watch how the planet deforms, and what consequences this has for rotation and internal properties like temperature.”Gillmann added.
This research, presented at the European Geosciences Union General Assembly, opens new frontiers in understanding planetary formation and evolution, particularly for Venus.
These findings could significantly reshape our understanding of planetary formation and rotation, as well as the potential for life on other celestial bodies. Studying the effects of large impacts on planets like Venus may help further our knowledge of evolutionary processes in systems similar to our own and the conditions that foster life. The study also underscores the importance of interdisciplinary work in astronomy and planetary science, which could lead to new discoveries in the field.
In addition to understanding Venus's unique rotation, researchers are also exploring the dynamics of other celestial bodies. For instance, recent findings indicate that Jupiter's remarkable ability to accelerate particles to unprecedented energies might shed light on the complex interactions occurring within our solar system. Such studies could provide valuable context for the ongoing investigations into planetary formation and evolution.