Kaol is right
The more exotic elements can only be formed by stars - or more accurately the death of stars (but not "death stars". That would be just silly). There is a steady stream of ionized helium (solar wind) from stars as the lighter elements are capable of escaping from the intense gravity of a star.

Heavier elements will only escape once the star gets to the point where it either turns supernovae (ie exhausts it's inner hydrogen fuel and basically blows itself apart), turns nova (not quite big enough to blow itself apart, so implodes and sprays its innards everywhere).

I still like kittens.
(Bicycle Repairman "you're also a bit of a wanker", Mon 3 Mar 2008, 15:59, Reply)