Rovers pave way to comprehending Mars San Francisco Chronicle

The sands of Mars inside the ancient crater named Gusev, wind- rippled and perhaps once briefly filmed by water, are marked now by the tracks of Spirit. Images of the rover tracks, documenting the imprint of human curiosity on an alien, rocky landscape, are some of the most remarkable pictures ever produced by the space program — part of the photographic legacy of NASA’s continuing robotic exploration of Earth’s nearest planetary neighbor.