Neil deGrasse Tyson hosts this inquiry into how life began on Earth, and on the possibilities for life elsewhere in the universe. "Earth is Born" investigates Earth’s first billion years. Evidence is reviewed about how the moon was formed, a s well as on the spread of water and oxygen on our planet. "How Life Began" searches some of the Earth’s deepest places for clues about how and where the first microbes developed. Letterboxed; DVD includes video descriptions. Both episodes p roduced and directed by Alice Harper. Closed captioned.