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Viking program
The Viking program consisted of a pair of American space probes sent to Mars, Viking 1 and Viking 2. Each spacecraft was composed of two main parts, an orbiter designed to photograph the surface of Mars from orbit, and a lander designed to study the planet from the surface...
Timeline of Events
1975
8.20.1975
Viking Program: NASA launches the Viking 1 planetary probe toward Mars.
1976
7.31.1976
Viking program: Viking 1
8.7.1976
Viking program: Viking 2 enters orbit around Mars.
9.3.1976
Viking program: The American ''Viking 2'' spacecraft lands at Utopia Planitia on Mars.