In 1962, after several failed attempts by both the United Statesand Russia, the Mariner 2 spacecraft reached Venus and sent backvaluable data about the planet's surface. Later in 1962, Russiasent the ship Mars 1 hurtling past Mars, the first such ship to doso. In 1973, Pioneer 10 made history by traveling through theasteroid belt and past Jupiter, eventually leaving the solarsystem. In 1974, the Mariner 10 unmanned spacecraft flew withinrange of Mercury, sending back thousands of photos of a cratered,moon-like surface. Launched in 1972, Pioneer 11 made the firstflyby of Saturn in 1979. Scientists continued to receive data fromPioneer 11 until 1995! By 1985, Voyager 2 passed by Uranus on apath that took it by all four of the outer planets. Four yearslater, in 1989, Voyager 2 also become the first craft to fly byNeptune. Voyager 2 returns data still today, although itsinstruments are expected to lose power by 2025.