Six planets – Venus, Mars ... the twin Voyager 1 and 2 spacecraft in 1977 on a "Grand Tour" of the outerSolar System. Voyager 1 flew past Jupiter in 1979 and Saturn in 1980, eschewing Uranus ...
A planet-sized visitor possibly visited the solar system billions of years ago and permanently changed the cosmic neighbourhood by warping the orbital path of four outer planets of the system, a ...