L23GH09Extraterrestrial_life

L23GH09Extraterrestrial_life - Extraterrestrial life? April...

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April 2, 2009 Extraterrestrial life Extraterrestrial life?
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April 2, 2009 Extraterrestrial life P275/S08 Final exam • When: Friday April 17 9:00-11:30AM •Where: PAC 9,10 •What: ¾ multiple choice, short answer, quantatitive ¾ similar to midterm in structure ¾ emphasis ~1/3 pre-midterm topics; ~2/3 post-midterm ¾ bring calculators ¾ equation list will be provided – preliminary version to be posted on course webpage by week’s end •Other: ¾ research project should be marked by late next week – I’ll post grades and info on how to get yours back ¾ assignment 4 available for pickup likely by Tuesday next week ¾ office hours TWTh 10-12; 2-4; for certain April 16 AM&PM ¾ check course webpage for other info and announcements
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April 2, 2009 Extraterrestrial life ET Life in Movies of the 1940s/50s H.G.Wells’ War of the Worlds initiated imagining of ET life, invasion, exploration, and mad scientists
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April 2, 2009 Extraterrestrial life Life: Definitions (from MB’s four primary sources) Google : the organic phenomenon that distinguishes living organisms from nonliving ones Wikipedia : “something” that exhibits: ¾ Organization ¾ Metabolism ¾ Growth ¾ Adaptation ¾ Reponse to stimuli ¾ Reproduction Hartmann : a series of chemical reactions using carbon-based molecules, by which matter is taken into a system and used to assist the system’s growth and reproduction, with waste products expelled. Woody Allen : full of loneliness, and misery, and suffering, and unhappiness – and it’s all over much too quickly.
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April 2, 2009 Extraterrestrial life The Chemistry of Life (as we know it) • Based on Carbon-Hydrogen bonds • Commonly include Oxygen and Nitrogen • Sometimes phosphorous •S i
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April 2, 2009 Extraterrestrial life Early Earth •So lar ±nebu la ±r ich ± in C, H, O, N and H 2 O • Earth forms, with hot interior ¾ Volcanic activity releases many gases, including water vapour.
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April 2, 2009 Extraterrestrial life Miller experiment • In the 1950s, Miller and Urey conducted an experiment ¾ Gaseous mix of H, ammonia, methane, H 2 O over a pool of liquid water ¾ Passed electric sparks through the gas ¾ After some time, amino acids appeared in the water
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Extraterrestrial life Amino acids • Amino acids are molecules from which proteins are built up ¾ e.g. : as produced in the original Miller-Urey experiment 2 2 5 2 2 4 3 5 2 2 H N O H C O H CH NH + + + • In a less primitive atmosphere,
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L23GH09Extraterrestrial_life - Extraterrestrial life? April...

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