Mars Spins Faster Each Year Due to Its Volcanic Past, Study Finds 2026

Mars is spinning faster each year, and its volcanic past is the culprit, according to a new study. The Red Planet, home to the largest volcano in the Solar System, is gradually accelerating its rotation, and scientists point to the movement beneath its surface as the cause.

This finding sheds light on the complex interplay between a planet's interior and its spin, offering clues about Mars' geological history and evolution.

Mars' Volcanic Legacy: Olympus Mons and Beyond

Mars is dominated by volcanic features. The most famous is Olympus Mons, a shield volcano that dwarfs anything on Earth. It spans 600 kilometers in diameter and rises about 22 kilometers high—more than twice the height of Mount Everest.

If it were to erupt, orbiting spacecraft would capture stunning images. However, neither Olympus Mons nor any other Martian volcano is confirmed active. Yet something is moving beneath the Martian soil.

Without tectonic plates, these volcanoes play a crucial role in the planet's geology. The entire planet is volcanic territory, with several hotspots. The main regions are Tharsis and Elysium Planitia.

Tharsis: A Volcanic Province

Tharsis is a vast region near the equator, covered with various volcanoes. On its western edge lies Olympus Mons. The region also hosts Alba Mons and the Tharsis Montes: Arsia Mons, Pavonis Mons, and Ascraeus Mons.

Elysium Planitia: Another Hotspot

Elysium Planitia is a broad plain also near the equator. It contains the Elysium volcanic complex, including Hecates Tholus, Elysium Mons, and Albor Tholus. These volcanoes, though smaller than Olympus Mons, contribute to the planet's volcanic activity.

Why Is Mars Spinning Faster?

The study suggests that the movement of magma beneath the surface is causing Mars to rotate slightly faster over time. As magma shifts, it changes the distribution of mass on the planet, affecting its moment of inertia.

This is similar to how a figure skater spins faster when pulling in their arms. The redistribution of mass due to volcanic activity acts like a brake or accelerator on the planet's rotation.

Scientists analyzed data from Mars orbiters and landers to track changes in the planet's gravity field and rotation. They found that the acceleration is tiny but measurable—about 4 milliarcseconds per year², which is equivalent to a shift of 10 centimeters over a Martian year.

What This Means for Mars Exploration

Understanding Mars' rotation is crucial for future missions. Precise knowledge of the planet's orientation and spin rate helps in landing spacecraft and operating rovers.

Additionally, studying the interior processes gives insight into Mars' thermal evolution and the potential for past or present habitability. The volcanic activity may have played a role in creating environments suitable for life. The longer history behind the story is traced in Mars Ice Dust Miscalculation: What It Means for Habitability.

• Mars' rotation is accelerating slightly each year due to subsurface mass redistribution.
• Olympus Mons, the largest volcano in the Solar System, is located in the Tharsis region.
• Tharsis and Elysium Planitia are the primary volcanic provinces on Mars.
• The study used data from Mars orbiters and landers to measure changes in gravity and rotation.
• Understanding these processes is important for future Mars missions and habitability studies.

Comparison of Martian and Earth Volcanism

The comparison highlights the unique geological setting of Mars. Without plate tectonics, volcanic activity persists in fixed hotspots, leading to the formation of massive volcanoes like Olympus Mons. The background to this story is set out in Mars Magma Discovery Suggests Hidden Habitable Potential. A related thread runs through Mars Magma Rivers Boost Chances for Life, Study Finds. Earlier coverage in Earthquake Near Naples: Seismic Swarm Injures 26, Raises Volcanic shows how the argument developed.

Future Research Directions

Further studies will focus on monitoring Mars' rotation with greater precision. Upcoming missions, such as the Mars Sample Return, may provide more data on the planet's interior. A closer look at the same subject appears in Lake Toba in Indonesia is the largest volcanic lake in the world. Anyone following the wider picture can start with Oris El Hierro Limited Edition, the volcanic roar of the Earth. The same theme surfaces in Human Hibernation for Mars: Is It Possible?, which takes a different angle.

Understanding the link between volcanism and rotation could also help explain the evolution of other rocky planets and moons in the Solar System. Context on how this played out before sits in Perseverance Sets Record for Longest Distance Driven on Mars. A companion piece, Mars Colonization Dreams: Why Space Colonies Are a Terrible Idea, approaches the same subject from another angle.