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Image of a fresh impact crater with a diameter of approximately 30 meters with corresponding ejecta rays obtained by NASA’s High Resolution Imaging Science Experiment camera on NASA's Mars Reconnaissance Orbiter on Nov. 19, 2013.
“Collisions are a pervasive physical process during planet formation and evolution,” Dr. Sarah T. Stewart, who is a Professor of Earth and Planetary Sciences at UC Davis, tells. “While the frequency of collisions is low today compared to the main stages of planet growth, they provide key insights into planetary dynamics, subsurface composition, and internal structure.
The reason why the massive crater from the Chixculub impact event is so well-hidden is due to the planetary surface processes that shape our planet, most notably from erosion, weathering, volcanism, and plate tectonics. These processes have also essentially erased up to millions of other impact craters that have occurred throughout the Earth’s approximate 4.6-billion-year history.
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