The rover was named in honor of Sojourner Truth (right), a 19th century abolitionist and champion of women's rights.
The name was suggested by Valerie Ambroise, 12, of Bridgeport, CT. Other suggestions included Sacagawea, Athena and Thumbelina.
Sojourner rover operated for 84 days - 12 times longer than its designed lifetime of seven days.
Among the mission firsts: Pathfinder was the first spacecraft to bounce on another planet and Sojourner was the first wheeled rover to explore another planet. Soviet Lunokhod rovers had previously explored Earth's Moon.
Pathfinder was the second in NASA's Discovery program of low-cost missions with highly-focused science objectives.