Table 2 Growing science capabilities of NASA’s Mars robotic missions as exemplified by each generation of Mars rover.

Mars roverMass (kg)Lifetime (sol)Distance traveled
(km) (as of April
2017)
Maximum traverse
speed (cm/s)
Science payload
mass (kg)
Science results
reported
MPF’s Sojourner10830.10.6<1(9)
MER’s Opportunity1854500*>4416(1012)
MSL’s Curiosity8991667*>15.98575(13)

*Still in operation as of 2017.