If the solar system formed out of a supernova explosion...?

yes, a nearby supernova explosion formed the heavy elements. BUT. when the sun was young, it formed a protoplanetary disk. where all the heavier elements sank to the sun. (helium, hydrogen) but the lighter elements spread all throughout the outer solar system (the gas giants today). while the heavier elements formed the terrestrial planets. (the four inner planets). as the answer below. stars have to consume all of its lighter weights in order to use its heavier elements. thats what makes it swell up and explode into a supernova. my answer is the best accepted scientific theory. look it up.