Mariner 4 was the first successful flyby of Mars. On this day in 1965, it made its closest approach and sent the first closeup images of the surface. These were also the first closeup images ever returned of another planet.
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Mariner 4 was the first successful flyby of Mars. On this day in 1965, it made its closest approach and sent the first closeup images of the surface. These were also the first closeup images ever returned of another planet.