BIOC58H3 Chapter 3: Ch3.docx

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15 May 2012
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Chap 3: the hadean and archeaen eons (4. 6-2. 5 bya) Earth and solar system formed, made from dust and gas cloud, some dust was size of small planets, (thea) collided with earth and made the moon (luna). Lunar/earth ratio of mass= 1:18. 3, greater than any ratio in solar system. Corpernican principle: nothing cosmologically special about earth having life. Moon believed to cause axial stability to earth (tilt angle), hence climate stability, planets with no large moon have half year of dark, half year of sunlight, on earth only polar regions are like this. After collision, water came from asteroids and proto-earth rocks, world was filled with co2, water vapour and methane, instead of oxygen (21% today) and nitrogen like today. Early sun only 30% as bright as today"s, so very powerful greenhouse gas effects was needed to keep earth warm enough for life back then.

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