When NASA’s Mars Pathfinder touched down in 1997, it had five cameras: two on a mast that popped up from the lander, and three on NASA’s first rover, Sojourner. Since then, camera technology has taken a quantum leap. Photo sensors that were improved by the space program have become commercially ubiquitous. That same evolution has returned to space. NASA’s Mars 2020 mission will have more “eyes” than any rover before it: a grand total of 23, to create sweeping panoramas, reveal obstacles, study the atmosphere, and assist science instruments.

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