Moonscape is a free and freely shareable high-definition documentary about the first manned Moon landing. Funded and produced by space enthusiasts from all over the world, it shows the full Apollo 11 landing and moonwalk, using only the original audio, TV and film footage and the original photographs, rescanned and restored from the best available sources, with full English subtitles (other languages will follow).
Rhea and Titan, as seen by Cassini.
Gorgeous colour-processed images from NASA probes. I could stare at the fountains of Enceladus all day.