How well do you know the worlds we share our solar system with? Time to grab pencil and paper and find out. This photo essay is a quiz: It asks you to ID the celestial body each image exhibits. Some worlds might be more recognizable than others, though the brief description of each picture offers subtle clues. Many entries also provide a sense of scale by noting altitude, diameter, or the distance from which a shot was taken, to help you get a better visual fix. Check your answers at the end (don't peek!) and see how you scored. Doubly challenge yourself by guessing the spacecraft that took each shot (name supplied with each image answer). Good luck!
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