... Saturns Moon Helene in Color . ... The moon was imaged in unprecedented detail last June as the robotic Cassini spacecraft orbiting Saturn swooped to within a single Earth diameter of the diminutive moon. ... On planet Gliese 876d, sunrises might be dangerous. ... Planet Earth has many moons. ... In 2010, ESA's robotic Rosetta spacecraft zipped past the asteroid 21 Lutetia taking data and snapping images in an effort to better determine the history of the asteroid and the origin of its unusual...