#PPOD: To mark 20 years of ESA’s Mars Express, the High Resolution Stereo Camera (HRSC) team produced a global colour mosaic: Mars as never seen before. The mosaic reveals the planet’s surface colour and composition in spectacular detail. Darker grey-toned areas of Mars represent grey-black basaltic sands of volcanic origin; lighter patches show clay and sulphate minerals; and the large scar across the planet's face is Valles Marineris. Credit: ESA/DLR/FU Berlin/G. Michael
