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. Cameras have shrunk in size, increased in quality and are now carried in every cellphone and laptop.
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. They will provide dramatic views during the rover’s descent to Mars and be the first to capture images of a parachute as it opens on another planet. There will even be a camera inside the rover’s body, which will study samples as they’re stored and left on the surface for collection by a future mission. [More at link]