The first spacecraft to orbit another planet circled Mars in 1971. It was:

Name: The first spacecraft to orbit another planet circled Mars in 1971. It was:
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Mariner 9 was the first spacecraft to orbit another planet, Mars, in 1971. Viking 1 and Voyager 1 were also spacecraft that explored space but did not orbit Mars. Apollo 1 was a spacecraft that was destroyed on the launch pad, and Venera 11 was a spacecraft that explored Venus.

The First Spacecraft to Orbit Another Planet Circled Mars in 1971