A recent study indicates that the impact rate on Mars may be two to ten times higher than previously thought, depending on the size of the meteorite.
Mars. The entire Valles Marineris system is visible in the center of the scene. Image courtesy of NASA Goddard Space Flight Center.
“Mars may be more geologically active than previously believed, which could have implications for the age and evolution of its surface,” stated Dr. Ingrid Dover of Brown University.
“Our findings, although based on a limited number of examples, suggest that current estimates of the impact rate on planets are much higher than what can be observed from images alone.”
Dr. Dauber and his team utilized sensitive seismometers on NASA’s InSight lander to discover eight new impact craters caused by meteorites that were previously unknown from orbit.
The frequency of these cosmic impacts challenges existing notions of how frequently meteorites collide with the Martian surface and indicates the need to revise current Martian crater models to accommodate higher impact rates, particularly from smaller meteorites.
This revelation has the potential to reshape our understanding of the Martian surface and the impact history not only of Mars but of other planets as well, as the Martian surface continues to be shaped by small meteorite impacts.
“This will necessitate a reassessment of the models used by the scientific community to estimate the ages of planetary surfaces across the solar system,” Dr. Dover added.
Of the craters discovered, six were in close proximity to the stationary InSight lander’s location.
The two distant impacts identified in the data were the largest ever detected by scientists, even after years of observation from orbit.
These two larger impacts, each resulting in football field-sized craters, occurred just 97 days apart, underscoring the increased frequency of such geological events.
“An impact of this magnitude might be expected once every few decades or even once in a lifetime, but to have it occur twice within 90 days is highly unusual,” Dr. Dover remarked.
“It’s possible it’s a mere coincidence, but the likelihood of that is slim.”
“It’s more probable that the two large impacts are linked, or the impact rate on Mars is significantly higher than previously assumed.”
“Planetary impacts occur regularly throughout the solar system.”
“Our interest lies in studying these impacts on Mars to compare and contrast them with those on Earth.”
“This is crucial for understanding our solar system, its constituents, and the population of objects that impact it – not just as a threat to Earth, but historically as a hazard to other planets too.”
Published in today’s edition of Scientific Advances.
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Ingrid J. Dover et al. 2024. Seismologically detected craters on Mars: Enhanced recent impact flux? Scientific Advances 10(26); doi: 10.1126/sciadv.adk7615
Source: www.sci.news
