Robotic missions to the red planet

Nov 18, 2020
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As you may probably know, all robotic missions humans sent to Mars were not enough successful, if to say frankly.
I wanna hear your thoughts and views, why this technique did not manage with aims?
 
Mar 6, 2020
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Not successful? They went great, Spirit and Opportunity were expected to last 90 days but managed 6 years in Spirit's case and 14 in Opportunity, during which they learned a lot about Mars's composition. I would call that a resounding success.
 

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