“Change is the nature of nature,'" she read. "'For example, stars expand as they grow older. They grow from a star, to a red super-giant, to a supernova. When a massive star explodes at the end of its life, the explosion dispenses different elements-helium, carbon, oxygen, iron, nickel-across the universe, scattering starduest. That stardust now makes up the planets, including ours.”