What a Mars Rover Actually Does on Another Planet
A Mars rover is not a remote-controlled car with a camera on top. It is a mobile geology lab that has to drive itself, pick its own targets, drill into rock, store samples, and send everything home from a planet where no human has ever stood. NASA's Perseverance rover, working in Jezero Crater since February 18, 2021, is the clearest example of what that job involves — and its latest milestone shows the work is still expanding. On October 11, its odometer reached 28.10 miles (45.22 kilometers), passing the previous off-world driving record held by NASA's Opportunity rover, and it did so in about five and a half years where Opportunity took almost fifteen. Why send a rover instead of a lander A lander can only study the ground it happens to touch. A rover can move to the interesting ground. Jezero Crater was chosen because it once held a lake and a river delta more than 3.5 billion years ago, and NASA says the site was picked after a five-year study of more than 60 candidate lo...