Missions Based On The 3MV Planetary Probe
Main article: 3MV planetary probe
The first three missions were based on the model 3MV planetary probe, intended to explore Venus and Mars. After two failures, Zond 3 was sent on a test mission, photographing the far side of the Moon (only the second spacecraft to do so) and continuing out to the orbit of Mars in order to test telemetry and spacecraft systems.
Read more about this topic: Zond Program
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