Science

I seem to recall, though I don't have a reference, that Californium has been detected either in stars or in supernovae. I would expect that in the r-process, particularly in the presence of heavy elements traveling at relativistic speeds albeit with very short free mean paths, some superheavy elements in period 8 occur. Almost certainly they undergo rapid fission or decay, but the rate of formation could be appreciably high.

One wonders where in the periodic table a neutron star would lie.

An argument is often made that at least some of the thorium on this planet is the decay product of ²⁴⁴Pu and, less often, that some of the ²³⁵U arrived in the solar system, if not the Earth itself, and ²⁴⁷Cm.

If one wants to get a little weird about it - and I'm prone to that - one can argue that nuclear energy is sort of "solar" since it originates in stars.