You've probably heard that "we are stardust," but this graphic breaks it down further & tells you what kind of stars your dust came from--and which elements didn't come from stars at all.
@coreyspowell I thought they discovered plutonium in New Hampshire pitchblende because of U238 getting the occasional neutron; did they see Pu in the spectrum of some astrophysical object? I can't see very much getting here from a neutron star collision
Plutonium-244 has a long enough half-life that it has been found in cosmic dust, generally thought to be from supernova remnants. It's been used in attempts to determine the chronology of seabed sediment deposition. As far as practical chemistry is concerned, however, it's strictly a man-made element.