In contrast to Earth, where natural
The idea behind crater dating is that the more craters, the older the surface.But craters form when asteroids and comets collide with the surface.The speed of these cosmic collisions over eons is unknown, limitingthe ability to convert the number of craters into the age of the area.
Scientists used radiometric ageprecious moonstones delivered by the Apollo missions to calibrate the chronology of the lunar crater. This lunar chronology is then extrapolated to Mars, and this is where things get confused with the earliest evolution of the solar system. Our understanding of the temporal evolution of the intensity of collisions with the Moon and Mars has improved significantly in recent years. This model improves how critical extrapolations from the Moon to Mars are performed.
Jezero Crater, the landing site of the Mars 2020 Perseverance rover, may have been formed for more than 3 billion years500 million years older than previously thought.NASA plans to collect and package surface samples that could be collected by a future mission to return to Earth for radiometric dating.
Jezero Crater has a diameterabout 48 km and is located in the 1,255-kilometer-wide Isidis basin formed by an earlier meteorite impact.The latter cut through a wide portion of the edge of the Borealis Basin, arguably the largest and oldest impact basin on Mars.
In addition, Jezero crater contains richclay of the area and a river delta, which indicates that there was once a lake in the crater. This makes it an ideal location to fulfill the scientific goal of the Mars 2020 mission to study a potentially habitable environment that may still show signs of a past life. Thus, understanding the timeline of these surfaces is especially important.
The new model also gives a revised agethe Isidis Basin, which is now estimated to be 4–4.2 billion years old, giving an upper limit for Jezero crater formation and water activity at that location on Mars.
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