when looking at the Mars 2020 mission, I imagine that there is high risk and many aspects of the mission that could go wrong.

when looking at the Mars 2020 mission, I imagine that there is high risk and many aspects of the mission that could go wrong. What are some of the major risks scientists have to prepare for, and additionally, what are some events (if any) that have gone wrong in recent history that were unprecedented, but have improved safety precautions for future missions.

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