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The Mariner 10 space probe was the last spacecraft in the Mariner program, and launched on 3 November 1973. Its mission was to measure the atmospheric, surface, and physical characteristics of Mercury and Venus. After taking some 4000 photographs of Venus, Mariner 10 then flew by Mercury, taking the first photographs detailed enough to reveal the planet's cratered surface and a faint atmosphere of predominantly helium.

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16y ago

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