Mariner interplanetary era — 2 museum-grade prints from the period. Mariner 10's Venus gravity assist on 5 February 1974 was the first use of a planetary flyby to reshape trajectory — a technique that later enabled Voyager's Grand Tour, Cassini's Saturn arrival, and countless delta-v savings across the solar system. The three Mercury flybys mapped nearly half the planet's surface, revealing cratered highlands and confirming a weak magnetic field unlike the Moon. Mariner 2's Venus flyby on 14 December 1962 was humanity's first successful encounter with another planet — a robotic prelude to every later flyby, orbiter, and lander. The mission confirmed Venus as an extreme greenhouse world with surface temperatures hot enough to melt lead, data that redirected planetary science toward atmospheric physics.

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