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Viking program: Viking 2 enters orbit around Mars.
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Viking program
Pair of NASA landers and orbiters sent to Mars in 1976
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…Source: Wikipedia (CC BY-SA)
Viking 2
Space orbiter and lander sent to Mars
The Viking 2 mission was part of the American Viking program to Mars, and consisted of an orbiter and a lander essentially identical to that of the Viking 1 mission. Viking 2 was operational on Mars for 1281 sols. The Viking 2 lander operated on the surface for 1,316 days, or…Source: Wikipedia (CC BY-SA)
Mars
Fourth planet from the Sun
Mars is the fourth planet from the Sun. It is also known as the "Red Planet", because of its orange-red appearance. Mars is a desert-like rocky planet with a tenuous carbon dioxide atmosphere. At the average surface level the atmospheric pressure is a few thousandths of Earth's,…Source: Wikipedia (CC BY-SA)
August 7
Day of the year
August 7 is the 219th day of the year in the Gregorian calendar; 146 days remain until the end of the year.Source: Wikipedia (CC BY-SA)