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.
This picture (centered at latitude 10 degrees S., longitude 74 degrees W.) shows much of Mars' Melas Chasm and a portion of Candor Chasm (upper right) in central Valles Marineris as seen by NASA's Viking Orbiter 2.
Mars' Syria Planum-centered volcanism and tectonism produced fractures, narrow to broad grabens, large scarps, and broad fold and thrust ridges that deformed a basement complex captured by NASA's Viking Orbiter 2.
Tharsis-centered volcanic and tectonic activity resulted in the formation of radial grabens of Memnonia Fossae, which cut materials of the ancient cratered highlands and the relatively young, highland-embaying lava flows as seen by NASA's Viking Orbiter 2
Operation of the surface sampler in obtaining Martian soil for NASA's Viking 2's molecular analysis experiment. Dubbed 'Bonneville Salt Flats,' the exposure of thin crust appeared unique in contrast with surrounding materials.
An oblique, color image of central Valles Marineris, Mars showing relief of Ophir and Candor Chasmata; view toward east. The photograph is a composite of NASA's Viking high-resolution images in black and white and low-resolution images in color.
An oblique, color image of central Valles Marineris, Mars showing relief of Ophir and Candor Chasmata; view toward north. The photograph is a composite of Viking high-resolution images in black and white and low-resolution images in color.