Tuesday, July 04, 2017

Mars exploration took a big leap 20 years ago on July 4, 1997.  NASA's Pathfinder mission touched down on the Red Planet, delivering a lander and a small rover called Sojourner — the agency's first wheeled Mars craft — to the surface.

Pathfinder helped pave the way for two decades of eight other NASA robots to have reached Mars, and five of them remain active today.

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