In geometry, a sphere packing is an arrangement of non-overlapping spheres within a containing space. The spheres considered are usually all of identical size, and the space is usually three-dimensional Euclidean space. However, sphere packing problems can be generalised to consider unequal spheres, n-dimensional Euclidean space (where the problem...
Found on
http://en.wikipedia.org/wiki/Sphere_packing
See packing, Kepler's conjecture, and Cannonball Problem.
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http://www.daviddarling.info/encyclopedia/S/sphere_packing.html
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