NASA / JPL-CALTECH / SCIENCE PHOTO LIBRARY NASA / JPL-CALTECH / SCIENCE PHOTO LIBRARY
Mariner 4 was launched November 28, 1964 on a 228-day mission to Mars. The spacecraft carried instruments for eight interplanetary and planetary experiments. Mariner 4 passed Mars at a distance of 9,868 kilometres (6,118 miles), recording and transmitting to Earth our first close-up picture of the red planet. Mariner's camera scanned about one percent of the Martian surface, revealing ancient craters of varying size. Planetary science data, including pictures, were transmitted over distances ranging from 215 million to 240 kilometres (134 million to 150 million miles).
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