Viking 1 was launched on August 20, 1975, and the second craft, Viking 2, was launched on September 9, 1975
In 1976 - None, ditto 1977, 1978, 1979 and all the other years.
The first man made probes to successfully land on the surface of Mars were two Soviet probes; Mars 2 on November 27 and Mars 3 on December 2, 1971, but both ceased communicating within seconds of landing. The NASA Viking program had two landers; Viking 1 remained operational for six years, Viking 2 for three years after their 1976 landing.
The purpose of the Viking 1 and Viking 2 missions, which were launched by NASA in 1975, was to search for signs of life on Mars. These missions consisted of a combination of orbiters, landers, and instruments designed to analyze the Martian surface and atmosphere for potential biological activity.
The Viking Space Probes did not go to Jupiter. They were used to explore Mars.
Viking 1 and Viking 2 landed on Mars in 1976 and Mars Pathfinder (and the Mars rover Sojourner) landed on Mars in 1997 and are still up there moving and functioning today.
Mars
The Viking 1 and Viking 2 missions consisted of both an orbiter and a lander. The landers successfully touched down on the surface of Mars, while the orbiters remained in Mars' orbit to relay communications and data between the landers and Earth.
In 1976 - None, ditto 1977, 1978, 1979 and all the other years.
The first man made probes to successfully land on the surface of Mars were two Soviet probes; Mars 2 on November 27 and Mars 3 on December 2, 1971, but both ceased communicating within seconds of landing. The NASA Viking program had two landers; Viking 1 remained operational for six years, Viking 2 for three years after their 1976 landing.
The purpose of the Viking 1 and Viking 2 missions, which were launched by NASA in 1975, was to search for signs of life on Mars. These missions consisted of a combination of orbiters, landers, and instruments designed to analyze the Martian surface and atmosphere for potential biological activity.
In 1976 twin Viking spacecraft reached Mars. Each of the Viking landers carried a small laboratory meant to search for life forms. These laboratories tested Mars's air and soil for signs of life. None of these test showed evidence of life.
The Viking Space Probes did not go to Jupiter. They were used to explore Mars.
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The two VIKING probes arrived in Mars orbit in 1976 when they started sending photographs back to Earth. The two orbiters continued sending photographs and the landers conducted experiments on the planet's surface until they failed as follows:Viking 2 Orbiter: July 1978 Viking 2 Lander: April 1980 Viking 1 Orbiter: August 1980 Viking 1 Lander: November 1982.
In 1976 twin Viking spacecraft reached Mars. Each of the Viking landers carried a small laboratory meant to search for life forms. These laboratories tested Mars's air and soil for signs of life. None of these test showed evidence of life.
Viking 1 and Viking 2 were launched by the US in 1975. Both probes traveled to Mars, took photos of large expanses of the planet's surface from orbit, and released landers. The Viking 1 lander later transmitted the first pictures from the Martian surface. Both landers carried experiments designed to detect living organisms or life processes, but neither of them found any convincing signs of life. The Vikings and their landers were unmanned (robotic) spacecraft.