In a little more than seven minutes in the early afternoon of Feb. 18, 2021, NASA’s Mars 2020 rover will execute about 27,000 actions and calculations as it speeds through the hazardous transition from the edge of space to Mars’ Jezero Crater. While that will be the first time the wheels of the 2,314-pound (1,050-kilogram) rover touch the Red Planet, the vehicle’s network of processors, sensors and transmitters will, by then, have successfully simulated touchdown at Jezero many times before.