Contents

07 December 2001
Vol 294, Issue 5549

About The Cover

Cover image expansion

COVER A Mars Orbiter Camera image from 23 February 2000. Meter-scale changes detected in the course of a martian year in the pits and mesas of the perennial south polar cap suggest that it mostly consists of CO2 ice. These findings indicate that significant climate change is occurring on Mars. 2146 [Image M12-02295: NASA, Jet Propulsion Laboratory, and Malin Space Science Systems; 87°S, 341.5°W; width 2.8 km, north toward left, sunlight from lower right and 20° elevation]