• Pair of US space probes sent to Mars in 1975 and arriving in 1976. Viking 1 and 2 each consisted of a lander and an orbiter. The Vikings supplied tens of thousands of photographs of the Martian surface, from orbit and from ground level, as well as data on the composition of the polar caps and atmosphere of Mars. They are popularly remembered for a series of experiments designed to test for the presence of absence of life on Mars – which yielded no results encouraging to believers in Martians. The Vikings were a technological development of the US Mariner spacecraft sent to Mars, and there is a possibility of later Vikings which would rove the surface of Mars instead of remaining static there.

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