NASA has several spacecraft and rovers on and around Mars performing scientific studies of the Red Planet. The Opportunity rover has been on the surface of Mars since 2004 and recently set a record. Opportunity has set a record for the longest distance ever driven off the Earth.
Opportunity has been on the surface of the Red Planet for a decade and has driven 25 miles. The previous record for the most miles driven off-Earth was held by the Soviet Union Lunokhod 2. The record was grabbed on July 27 as Opportunity drove 157 feet to reach 25.01 miles on the odometer.
If the rover continues to operate, it will reach its next major investigation site mission called Marathon Valley. Scientists want to study this area because they believe clay minerals are exposed close together at the site.
