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Minute quantities of the fullerenes, in the form of C60, C70, C76, C82 and C84 molecules, are produced in nature, hidden in soot and formed by lightning discharges in the atmosphere
There is a maxim about the universe which I always tell my students: That which is not explicitly forbidden is guaranteed to occur.
The spectral signature of "Buckyballs" has also been discovered in deep space; some of these fullerenes must contain other atoms.
... fullerenes extracted from the Allende and Murchison meteorites contained endohedral helium ...