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Using infrared images from NASA's Spitzer Space Telescope, scientists have discovered that the Milky Way's structure is dominated by two spiral arms wrapping off the ends of a central bar of stars. This interactive shows such structure over an artist's concept illustration published by NASA.
The Solar System consists of the Sun and those celestial objects bound to it by gravity, all of which were formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago.
Celestial map from the 17th century, by the Dutch cartographer Frederik de Wit. Source: Wikipedia.
This map shows lunar landings from the mid-1960s to the mid-1970s in Apollo, Luna and Surveyor space programs. Featured in a below layer can be seen main selenographic accidents, such as lunar mare and craters.