The NASA mission(s)that landed on Mars in 1976 was (were)the:

Name: The NASA mission(s)that landed on Mars in 1976 was (were)the:
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The NASA missions that landed on Mars in 1976 were the Viking 1 and Viking 2 missions, which were the first robotic landers to successfully operate on the Martian surface. The two NASA missions that landed on Mars in 1976 were the Viking 1 and 2 landers, not the Voyagers, Magellan lander, Venera 14, or Galileo probe.

The NASA Mission(s)that Landed on Mars in 1976 Was (Were)the