More signs of water, dunes that resemble shark’s teeth and the passage of time are chronicled in the latest batch of Red Planet images released by Malin Space Sciences Systems, the operator of the camera aboard NASA’s current Mars orbiter. Mars Global Surveyor ended its main mission last week after collecting global data throughout a complete 26-month Martian year. The probe is set to continue taking pictures of Mars through 2002 on an extended mission. So far, images taken by this spacecraft’s camera have been interpreted as showing evidence of ancient lake beds and recent water seeping up to the surface.