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The mission would also provide opportunities to gather knowledge and demonstrate technologies that address the challenges of future human expeditions to Mars

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Spirit and Opportunity Rovers on Mars have given us

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Spirit and Opportunity Rovers on Mars have given us

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Have given over 100,000 clear pictures of Mars

Microscopic pictures of rocks and soil

They have been on mars for 2 and a half years

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lander on Mars

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lander: landed on Venus

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lander: landed on the Moon

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Lander: landed on Titan

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Rover: landed on mars

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why are they hard to land:

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They are hard to land on surfaces of some planets and bodies in space because there are deep canyons, mountains and many craters that make landing safely hard