Viking 1 and 2 was the first U.S. spacecrafts to land on the surface of mars in 1975. The mission was planned to go on for 90 days, but NASA were able to monitor the spacecrafts for up to four years.
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Viking 1 and 2 was the first U.S. spacecrafts to land on the surface of mars in 1975. The mission was planned to go on for 90 days, but NASA were able to monitor the spacecrafts for up to four years.