This image montage features a two-dimensional radar cross section of Mars' north polar cap collected by SHARAD instrument on NASA's Mars Reconnaissance Orbiter spacecraft (top), and a color image mosaic of the polar cap from NASA's Viking project (bottom)
Martian Morning Clouds Seen by Viking Orbiter 1 in 1976
No NASA Mars orbiter has been in a position to observe morning daylight on Mars since the twin Viking orbiters of the 1970s. This image, taken by Viking Orbiter 1 on Aug. 17, 1976, shows water-ice clouds in the Valles Marineris area of equatorial Mars.
This view of Lyot Crater is a combined mapping by NASA's Project Viking with elevation information from Mars Global Surveyor showing at least one of the nine craters in the northern lowlands of Mars with exposures of hydrated minerals detected from orbit.
Color mosaic of Olympus Mons volcano on Mars from the Viking 1 Orbiter. The mosaic was created using images from orbit 735 taken 22 June 1978. Olympus Mons is about 600 km in diameter and the summit caldera is 24 km above the surrounding plains.
Center is at Latitude 30 Degrees South, Longitude 90 Degrees
The top half of Mars is dominated by the Tharsis Montes volcanoes, the large Alba Patera shield volcano, the dark Chryse basin, and a vast canyon system, Valles Marineris in this image from NASA's Viking Orbiter 1.
Latitude 90 Degrees North to 90 Degrees South and Longitude 0 Degrees to 180 Degrees
Both polar residual ice caps are seen at top and bottom. The central part is dominated by the four largest and youngest volcanoes on Mars--Olympus, Arsia, Pavonis, and Ascraeus Montes in this image from NASA's Viking Orbiter 1.