On this day in 2018 – February 17th – it was the 5000th sol for NASA's Mars rover Opportunity on the red planet.

Opportunity's mission was originally planned for 90 sols. A sol is a Martian day, and it's just over 39.5 minutes longer than an Earth day. A severe planet-wide dust storm in the summer would finally end Opportunity's amazing mission.

Mona Evans
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