Also heavy elements that are required in enzymatic processes. I developed a theory about this many years ago after living on a volcanic island, and then told it to an astrophysicist at NASA, who said I should use it as my application essay to Stanford, which must have at least been entertaining enough for them to give me a chance. I don’t think it was a normal planet though. The high density and existence of gold here suggests a chunk of supernova emission. This planet may be exceptionally rare, and I worry about life ending because there aren’t a lot of these flying around anymore.