Spacecraft journeys. Composite computer artwork of the routes taken by various spacecraft probes through the solar system. The main image shows the routes of spacecraft exploring the whole of the solar system, whilst the inset image at top right shows just the inner solar system. The orbits of the planets are shown as blue lines; Earth is represented by the blue sphere in the inner solar system. The spacecraft routes have been colour- coded according to the key at bottom right, whilst the bodies they were launched to observe are given in parentheses. The five spacecraft seen here are (clockwise from bottom right): Pioneer, Voyager, Ulysses, Viking, and Magellan.