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In this illustration of a Mars sample return mission concept, a lander carrying a fetch rover touches down on the surface of Mars. NASA and the European Space Agency (ESA) are solidifying concepts for a Mars sample return mission after NASA's Mars 2020 rover collects rock and soil samples, storing them in sealed tubes on the planet's surface for future return to Earth. NASA will deliver a Mars lander in the vicinity of Jezero Crater, where Mars 2020 will have collected and cached samples. The lander will carry a NASA rocket (the Mars Ascent Vehicle), along with ESA's Sample Fetch Rov…
