NASA's First Mars Rover Actually Explored An Ancient Sea

Mars may be a dry, cold planet today, but it was once a warmer, wetter one. NASA’s Opportunity rover was the first rover to find solid evidence of water on Mars — but years before Opportunity’s discoveries, NASA’s first Martian rover mission spent its time exploring an ancient spillway that once connected Mars’ northern ocean to an inland sea. Mars Pathfinder landed 22 years ago, on July 4, 1997. The mission’s 23-pound (10.6 kilograms) rover, Sojourner, was the first rover to explore the

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