As the molecular cloud starts to collapse intro a future star, describe the main steps of the formation of the star and a planetary system (not a binary system). Make sure to address what is the first thermonuclear reaction that starts in the proto-star, how the cloud gets cleared off, why we get rocky and gas planets, why do we need planets, what is the main thermonuclear reaction (both for low and high mass stars,, hint - heavy elements are.