The third of five Lunar Orbiter satellites is launched to the moon by NASA, and once in orbit, Lunar Orbiter 3 achieves an unmanned spaceflight first: it’s the first unmanned space probe to image another unmanned space probe (in this case, Surveyor 1, which has been on the moon since 1966). A mechanical fault prevents Lunar Orbiter 3 from returning roughly a quarter of its images to Earth.
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