Life_Expectations -...

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http://news.bbc.co.uk/earth/hi/earth_news/newsid_9079000/9079963.stm 1
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Life: What Do We Expect? Stephen Eikenberry 12 October 2010 AST 2037 2
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Life Needs Need energy source and reproductive code Likely energy source: chemical energy Reproductive code: likely chemical, and requires complex molecules/chains A little weaker: May have a preference for liquid phase? Probably need a powerful solvent 3
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Complex Molecules Abundant elements in the Universe: H (can only bond with one electron) He (noble gas) C O Ne (noble gas) N Si Fe 4
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Other Options? Oxygen only makes two stable molecules with hydrogen: water (H 2 O) and hydrogen peroxide (H 2 O 2 ) Nitrogen only makes two also: ammonia (NH 3 ) and hydrazine (N 2 H 2 ) Fe also relatively limited in its bonding Carbon makes a nearly endless number of molecules/isomers with H Si also makes lots of molecules too 5
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Si vs. C Both C and Si can make complex chains and diverse
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This note was uploaded on 07/26/2011 for the course AST 2037 taught by Professor Eikenberry during the Fall '08 term at University of Florida.

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Life_Expectations -...

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