One of the earliest close-up views of Mars, from Mariner 6
A heavily cratered planet, apparently more like the Moon than the Earth
Another view of craters, showing possible dune-like and flow features
 Erosion and deposition features in and near a small (1 1/2 mile wide) crater inside 280 mile wide Schiaparelli crater. Dust laid down by aeolian deposition (winds or mere settling of dust) over the eons, or by sedimentary deposition at the bottom of an ancient lake which might have once filled Schiaparelli, has been weathered away, producing a terraced conical structure inside the crater. Meanwhile, sand dunes march across the landscape outside the crater. (Malin Space Science Systems, MGS, JPL, NASA, apod030815)
 Close-up of another 2 mile wide area inside Schiaparelli crater. As in the previous image, ancient sediments of aeolian (air) or fluvial (water) origin have been more recently eroded. The darker areas are presumably iron-rich sands. (Malin Space Science Systems, MOC, MGS, JPL, NASA, apod011127)
Autumn frost in Lowell crater
(Malin Space Science Systems, MGS, JPL, NASA, apod001201)
A 135-mile wide 'happy face' -- winter frost in Galle crater
(Malin Space Science Systems, MGS, NASA, apod990315)
Oddly rectangular ridges caused by wind excavation of an ancient crater
(Malin Space Science Systems, MGS, JPL, NASA, apod021001)
Olympus Mons, the largest volcano on Mars
Ceraunius Tholus (left), and Uranius Tholus, two "small" volcanoes in the Tharsis Ridge region.
The summit crater of Ceraunius Tholus is approximately 15 miles across.
(Malin Space Science Systems, MOC, MGS, JPL, NASA, apod020808)
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