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21st-Century Update of Ancient Tech Could Help Astronauts Explore Mars

When we finally do put humans on Mars, they'll face a major challenge: navigation. When we first poke around on the Moon, the astronauts never let the lander leave their sight. Considering the time and cost of a manned mission to Mars, however, our explorers will be expected to push further out from the landing zone. But, due to the Red Planet's lack of a strong magnetosphere, a compass would be ...