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Unformatted text preview: Origin of Organic Molecules Scientists hypothesize that the universe came into existence about 15 billion years ago with a colossal explosion often referred to as the big bang. The gases and dust from that explosion produced the earliest generation of stars, and over a period of billions of years, the stars exploded, and their debris formed other stars and planets. The solar system was presumably formed in this way 4 to 5 billion years ago. During the next billion years, the molten earth cooled, forming a hardened, outer crust. About 3.5 billion years ago, living things came into being. About 3.8 billion years ago, earth's atmosphere consisted of such elements as nitrogen, hydrogen, sodium, sulfur, and carbon. Some of these elements combined to form hydrogen sulfide, methane, water, and ammonia. Water vapor in this mist probably caused millions of years of torrential rains, water, and ammonia....
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- Fall '07
- Organic Molecules