1973 Prestige — 2 museum-grade prints that set the mood. 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. Skylab launched 14 May 1973 as the first US space station, occupying a converted S-IVB stage with an Apollo Telescope Mount for solar observations. The SL-2 crew's emergency repairs after launch damage became a template for on-orbit maintenance that later servicing missions would refine.