NASA’s Opportunity rover celebrated a monumental anniversary all by itself on the surface of the Red Planet: surviving 5,000 Martian days. It’s an incredibly significant milestone for the little-wheeled robot, given the fact that it was only expected to last just 90 days.
Source
https://www.theverge.com/2018/2/19/17027918/nasa-opportunity-rover-mars-5000-sols-anniversary