Sphere packing in a sphere is a three-dimensional packing problem with the objective of packing a given number of equal spheres inside a unit sphere. It is the three-dimensional equivalent of the circle packing in a circle problem in two dimensions.
Number of inner spheres
Maximum radius of inner spheres[1]
Packing density
Optimality
Diagram
Exact form
Approximate
1
1.0000
1
Trivially optimal.
2
0.5000
0.25
Trivially optimal.
3
0.4641...
0.29988...
Trivially optimal.
4
0.4494...
0.36326...
Proven optimal.
5
0.4142...
0.35533...
Proven optimal.
6
0.4142...
0.42640...
Proven optimal.
7
0.3859...
0.40231...
Proven optimal.
8
0.3780...
0.43217...
Proven optimal.
9
0.3660...
0.44134...
Proven optimal.
10
0.3530...
0.44005...
Proven optimal.
11
0.3445...
0.45003...
Proven optimal.
12
0.3445...
0.49095...
Proven optimal.
^Best packing of m>1 equal spheres in a sphere setting a new density record
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