Sidney M. Gonzalez's Blog Posts Tagged 'Sagan' (1)

Life: Where Did It All Start?

Issue 48 of Cosmos, December 2012 by Robin McKie


Earth formed about 4.6 billion years ago and life first appeared here about a billion years later. Scientists don’t agree over the processes involved but, according to some theories, extremophiles were involved.


Charles Darwin suggested life began in "a warm little pond". Earth's early atmosphere would have been rich in methane, ammonia, and other gases on…


Added by Sidney M. Gonzalez on January 31, 2013 at 9:20am — 4 Comments

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