Mariner 6
Launch date:Nation:
Outcome: success
Mariner 6 took near-encounter photos of Mars on 31 July 1969. Frame 19, 3613 kilometers from the surface, shows flat-bottomed craters a few kilometers to a few hundred wide. High-resolution frames 20 and 22 show smaller, bowl-shaped craters, resembling primary impact craters found on the moon.
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Jan 14