Buckminsterfullerene or Buckyball #5, C60. The carbon atoms are shown as grey spheres at their covalent radius (i.e. just touching). This image is 500 x 500 pixels; the original measures 4,096 x 4,096 pixels.
Buckminsterfullerene is a form (allotrope) of carbon. In this molecule, there are sixty carbon atoms arranged in a sphere (actually at the vertices of a truncated icosahedron). Fullerenes have rather exotic properties and these hollow balls of carbon atoms are likely to have many uses.