NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Mars. Mars Global Surveyor image of Mars during the summer in the northern hemisphere. This means it is winter in the southern hemisphere, and the south polar ice cap (white, bottom) is at its largest. Four huge volcanoes are visible here, wreathed in white clouds. Olympus Mons, the largest volcano in the solar system, is at upper centre. Below and right of it are the three Tharsis Ridge volcanoes. From lower centre to upper right, they are Arsia Mons, Pavonis Mons and Ascraeus Mons. This image was taken by the Mars Orbiter Camera (MOC) on the MGS spacecraft in orbit around Mars.
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