"Every space mission to a new place-whether human or robotic- has to carry a camera," Cornell University astronomer Jim Bell writes in the preface to his book Postcards from Mars, which gathers images from the rovers Spirit and Opportunity. "These cameras are the eyes that have to tell the stories of new alien worlds to the people back home who couldn't go." We asked the scientists and writers who contributed to our Mars Journal to pick their favorite photos of Mars, the pictures that best tell the planet's story.
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