On this day in 2018 – February 17th – it was the 5,000th sol that NASA's Mars rover Opportunity had been 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 of 2018 would finally end Opportunity's amazing mission.