Goals: This Zond spacecraft was originally slated for a trip to Mars, but when it couldn't be prepared in time Soviet scientists instead made it a lunar mission to test basic systems and send back more photographs of the far side of the Moon.

Accomplishments: Zond 3 photographed the unseen 30 percent of the far side of the Moon. It also demonstrated successful course correction using both solar and stellar orientation, a first for a Soviet spacecraft.