Third Evening—A Dusty Yellow Star
The end stages of nucleosynthesis initiated a process that led automatically to one more cycle of darkness and light. In the third cycle of darkness and light, gravity collected dry dust, rich in all the elements needed for life, into planets where life could begin. It also formed new stars incorporating this dust. These stars burned at lower temperatures than the first stars because one of the heavy elements in the dust was carbon. Carbon catalyzes the nuclear reactions that burn hydrogen into helium. The early stars were bluish-white, but the new stars were yellow. Yellow light is much better for life than the light of bluish-white stars, as we shall later see. One yellow star became our Sun, our source of light for the third day.