Mars is bombarded by meteoroids at more frequent rates than previously thought

Mars, according to recent research, experiences a higher frequency of meteoroid impacts than previously estimated. The new findings suggest that current impact rates on Mars may be 2-10 times higher than previously believed, depending on the size of the meteoroids. Dr. Ingrid Daubar from Brown University explains that these findings could indicate that Mars has greater geological activity than previously thought, which has implications for the planet's surface age and evolution.

The research team, including Dr. Daubar, made these discoveries using the sensitive seismometer onboard NASA's InSight lander. By analyzing the data, they identified eight previously unknown impact craters caused by meteoroids that could not be detected from orbit alone. This challenges previous assumptions about the frequency of meteoroid collisions on Mars. Specifically, it suggests that current models of Martian cratering should be revised to account for the higher impact rates, especially from smaller meteoroids.

Notably, the discoveries made by the researchers could have profound effects on our understanding of Mars' surface and the historical pattern of impacts on the planet, as well as on other celestial bodies. Dr. Daubar emphasizes that the findings necessitate a reevaluation of the models used by the scientific community to estimate the age of planetary surfaces throughout the Solar System.

In terms of the impact craters identified, six were located near the landing site of the stationary InSight lander. However, the two most significant impacts found were the largest ever detected by scientists, a mere 97 days apart. Dr. Daubar notes that such large-scale impacts were expected to occur once every few decades or even once in a lifetime, making the close timing of the two events an intriguing occurrence. While it could be a coincidence, the likelihood is incredibly slim, suggesting a higher than anticipated impact rate for Mars.

The implications of this research extend beyond Mars alone. As Dr. Daubar explains, studying planetary impacts on Mars allows for comparisons with Earth, aiding our understanding of our solar system and the population of impacting bodies within it. This knowledge is crucial for evaluating both the hazards posed to Earth and the historical impact events on other planets.

Published in Science Advances, this study calls for a reevaluation of our understanding of Mars' impact history, shedding light on the dynamic nature of our solar system. The higher than anticipated frequency of meteoroid impacts on Mars challenges existing notions and necessitates a broader perspective when considering the planetary processes shaping our celestial neighborhood.