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Mars’ Unusual Spin (Faster): NASA Unveils New Findings

Mars, the enigmatic Red Planet, has taken scientists by surprise once again. In a recent revelation, NASA’s Mars Insight lander has detected a slight but significant increase in the planet’s rotation speed, leading to a fractional reduction in the length of a Martian day. While the change might seem minuscule, it sheds light on the intricacies of Mars’ unique behavior.

Although the Mars Insight lander may have recently ceased functioning due to dust-covered solar panels, its data continues to offer insights into the mysterious planet. Among the latest discoveries is the revelation about Mars’ rotation, meticulously measured over the vast expanse of 100 million miles using an instrument known as the Rotation and Interior Structure Experiment (RISE). This instrument, equipped with radio transponders and antennas, has provided a remarkable understanding of Mars’ rotation and its intriguing wobbling motion.

Unraveling the inner workings of Mars carries immense significance. It offers scientists a fresh perspective on the planet’s origin, evolutionary changes, and the factors influencing its habitability. Bruce Banerdt, the principal investigator of Insight, expressed his excitement over the precision of the latest measurement, emphasizing that decades of efforts to get a geophysical station onto Mars have been justified by such groundbreaking results.

Throughout its active phase, the Mars Insight lander diligently studied over 1,000 marsquakes and gathered daily weather reports from the Martian surface. This comprehensive approach facilitated the mapping of Mars’ inner geology and provided invaluable insights into its historical transformation.

One of the key revelations from the Mars Insight data is the mounting evidence supporting the existence of a molten iron core at the center of the planet. Contrary to a cooled, solid iron core, this finding aligns Mars more closely with Earth and Venus. This discovery holds profound implications for understanding the planet’s formation, evolution, and its potential to harbor life. The research that unveiled these findings was recently published in the journal Nature.

This groundbreaking insight builds upon previous research. A study published in the Proceedings of the National Academy of Sciences earlier this year utilized Insight’s seismic data to uncover further evidence of a liquidy core enriched with sulfur and oxygen. This distinct composition, less dense than Earth’s core, hints at disparate formation conditions between the two planets.

Credit: NASA / JPL-Caltech / Mashable

Nicholas Schmerr, a geologist from the University of Maryland, highlights the significance of a planet’s core properties as a reflection of its formation and dynamic evolution. He underscores how the unique nature of Earth’s core, generating a protective magnetic field, shapes its hospitable surface conditions for life, while Mars’ lack of such a shield creates a hostile environment.

To track Mars’ rotation rate, scientists employed NASA’s Deep Space Network, which communicates with distant spacecraft using radio signals. These signals were transmitted to the Insight lander on Mars, and its RISE instrument measured the variations in the returning signals’ frequency. By analyzing data collected during the first 900 Martian days, scientists discerned subtle changes in Mars’ rotation speed.

The intriguing aspect is the uncertainty surrounding the cause of Mars’ accelerated rotation. Scientists speculate that factors such as ice accumulation on the polar caps or post-glacial rebound, causing land masses to rise after being buried under ice, might contribute to this phenomenon. An analogy drawn to an ice skater adjusting their spin by pulling in their arms illustrates the shift in a planet’s mass leading to acceleration.

Additionally, the RISE data provided insights into Mars’ wobbling motion, driven by liquid sloshing within the planet’s core. This wobble measurement enabled scientists to estimate the core’s size, revealing a radius of 1,140 miles, approximately half the planet’s diameter. Notably, studying Mars’ wobble unveiled deformations within the core caused by concealed masses in the mantle.

As our understanding of Mars continues to evolve, the data gathered by the Mars Insight lander paints a more intricate picture of the Red Planet’s dynamics. The unique behavior of Mars’ rotation and wobble adds another layer to the captivating story of our neighboring world.


  1. What is the significance of Mars’ changing rotation speed? Mars’ accelerated rotation, though slight, offers insights into the planet’s internal dynamics and potentially its geological processes. It allows scientists to refine their understanding of Mars’ formation and evolution.
  2. How did the Mars Insight lander measure Mars’ rotation rate? The Mars Insight lander utilized an instrument called the Rotation and Interior Structure Experiment (RISE) to measure Mars’ rotation speed. Radio signals were sent from Earth, bounced off the lander, and analyzed for changes in frequency to determine the planet’s rotation rate.
  3. What does the evidence of a molten iron core on Mars imply? The existence of a molten iron core on Mars aligns it more closely with Earth and Venus. It sheds light on the planet’s geological history, formation, and potential to support conditions conducive to life.
  4. What are some factors that could contribute to Mars’ accelerated rotation? Scientists speculate that Mars’ increased rotation speed might be attributed to ice accumulation on polar caps or post-glacial rebound, causing land masses to rise after being buried under ice.
  5. How does Mars’ rotation compare to Earth’s? Mars’ rotation is significantly slower than Earth’s, resulting in longer days on Mars. However, the recent discovery suggests that Mars’ rotation is subtly speeding up, albeit by a fractional amount.
Credit: NASA / JPL-Caltech illustration / Mashable


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