This puzzle presents our solar system in a simple, fun way, with the sun, nine planets and Earth's moon represented by coloured, wooden half-spheres.  Each piece sits in its own inset spot, and silk-screened graphics on the board shown the planets' orbits as well as the eliptical track of Halley's comet around the sun.  The puzzle board measures 43 x 30 cm (about 17" x 12").