See the far side of the Sun- and know that the Sun rotates on its axis too. Also a good explination of carbon-12 CO2 and how it interplays with the atmosphere, ocean, rocks, plants mammals and humans. Also information on carbon-13 CO2 and carbon-14 CO2. note: carbon-14 CO2 is radioactive. Good story on evolution, and on Mars. On Mars Co2 moves into the ground and is released from the ground, to the atmosphere with the seasons change. Ref: San Diego Union-Tribune, 4 /25/11 ppE2 & ppE4

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