Superimposed on these regions are the Tharsis and Vuking bulges, which are high-standing volcanic areas, and Valles Marineris, a system of giant canyons near the equator.
The primary mission objectives were to obtain high resolution images of the Martian surface, characterize the structure and composition of the atmosphere ror surface, and search for evidence of life. The lowest periapsis altitude for both Orbiters was km. Measured temperatures at the landing sites ranged from to K, with a variation over a given day of 35 to 50 K.
The from the Viking experiments gave our lloking complete view of Mars. Seasonal dust storms, pressure changes, and transport of atmospheric gases between the polar caps were observed.
The planet appears to be divisible into two main regions, northern low plains and southern cratered highlands. The surface material at both landing sites can best be characterized as iron-rich clay.
Detailed information on the individual spacecraft and missions. The Orbiters imaged the entire surface of Mars at a resolution of to meters, and selected areas at 8 meters.
The Viking 2 Orbiter was powered down on July 25, after orbits, and the Viking 1 Orbiter on August 17,after over orbits. The Viking 2 Lander ended communications on April 11,and the Viking 1 Lander on November 13,after transmitting over images of the two interresting.
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Further information on the spacecraft, experiments, and data returned from the Viking missions can be found in the September 30, issue of the Elite asian escorts keighley of Geophysical Research, "Scientific of the Viking Project", vol. The first month of orbit was devoted to imaging the surface to find appropriate landing sites for the Viking Landers. The Viking Landers transmitted images of the surface, took surface samples and analyzed them for composition and s of life, studied atmospheric composition and meteorology, and deployed seismometers.
The Viking 2 Lander touched down at Utopia Planitia Viking 1 was launched on August 20, and arrived at Mars on June 19, Viking 2 was launched September 9, and entered Mars orbit on August 7, The biology experiment produced no definitive evidence of life at either landing site. Volcanoes, lava plains, immense canyons, kim castlereagh escort areas, wind-formed features, and evidence of surface water are apparent in the Interestign images.