Today's APOD http://apod.nasa.gov/apod/ap160125.html Shows this fascinating table. What a pity that is doesn't show isotopes. Strange are Ba, La, Ce which are shown as large star but not supernova. The article says that the origin of Cu is not well known. Fascinating. I'm curious about the large star elements heavier than iron. Is neutron capture the only mechanism for their formations? I'm also curious about transport. How did "large star" elements, not supernova, get transported to the sun's primordial dust cloud? Zinc for example. We have lots of zinc.