I have seen it claimed online that the recently announced observation of a neutron-star merger by LIGO provides strong support for the hypothesis that heavy elements - gold and platinum were mentioned in particular - are mostly created in neutron-star collisions rather than in supernovas. Is this correct? Where can I find reliable information about this story? In fact, where can I read about this hypothesis at all? Until today supernovas were the only source I heard mentioned for elements not created in the normal stellar fusion reactions.