マーズ・エクスプレス
More than 20 years after the "Viking 1" images were taken, a succession of spacecraft visited Mars and made new observations of the Cydonia region. These spacecraft have included NASA's "Mars Global Surveyor" (1997–2006) and "Mars Reconnaissance Orbiter" (2006–), and the European Space Agency's "Mars Express" probe (2003–). In contrast to the relatively low resolution of the Viking images of Cydonia, these new platforms afford much improved resolution. For instance, the "Mars Express" images are at a resolution of 14 m/pixel (46 ft/pixel) or better. By combining data from the High Resolution Stereo Camera (HRSC) on the "Mars Express" probe and the Mars Orbiter Camera (MOC) on board NASA's "Mars Global Surveyor" it has been possible to create a three-dimensional representation of the "Face on Mars".