Mars No. 42-22377801
by NASA-JPL-Caltech - digital versi - © Corbis. All Rights Reserved. - © NASA-JPL-Caltech - digital versi/Science Faction/Corbis
Defrosting Crater - Seen by Mars Global Surveyor
Patterns created by subliming carbon dioxide frost surround an impact crater in the south polar region of Mars. The dark, spotted features at the bottom and right are patches of windblown sand that have been covered with frost. Image selected by editors, including Science Faction's Roger Ressmeyer, assembled by NASA to honor the 30th anniversary of Viking 1's soft landing on Mars. --- Image by © NASA-JPL-Caltech - digital versi/Science Faction/Corbis