2. The rover’s original 90-sol mission is also referred to as its “warranty period.” That means as of sol 4,970, Opportunity is 4,880 sols past warranty.
3. Spirit and Opportunity were designed to cover about 0.6 mile (1km) during that original 90-sol mission. On July 28, 2014, NASA officials announced that Opportunity had broken the record for
off-world driving after it hit a distance of 25.01 miles (40.2km). The previous record-holder was the Soviet Union’s Lunokhod 2 rover, which drove 24.2 miles (39km) on the Moon in 1973.
4. In March 2015, Opportunity marked another milestone: It had covered the distance of a standard marathon (26.2 miles [42.2km]) in just over 11 years. Its destination at the time was named Marathon Valley in honor of the accomplishment.