... Data from the Magellan spacecraft has shown the Face of Venus to contain a host of volcanic features. ... A comet nucleus, formed from the primordial stuff of the solar system, resembles a very dirty iceberg. ... After taking its spectacular pictures of the outer solar system planets, Voyager 1 looked back at six planets from the inner solar system. ... Mercury is the closest planet to the Sun, the second hottest planet (Venus gets hotter), and the second smallest planet (Pluto is smaller). ...