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Viking program
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Pair of NASA landers and orbiters sent to Mars in 1976
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The Viking program consisted of a pair of identical American space probes, Viking 1 and Viking 2 both launched in 1975, and landed on Mars in 1976. The mission effort began in 1968 and was managed by the NASA Langley Research Center. Each spacecraft was composed of two main parts: an orbiter spacecraft which photographed the surface of Mars from...

Elsewhere
Websitenasa.gov
Instance of
NASA program
References
Wikidata