originoflife

originoflife - The origin of life The age of the Universe...

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The origin of life
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The age of the Universe is a concept that is not easily visualized. The Cosmic Calendar is an analogy that can help us realize the concept of “Deep Time”. This comparison was devised by Carl Sagan .
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Imagine that the age of the Universe ( ~13.7 billion years ) is converted to one of our 365-day years . . . In this conversion, each month would equal a little over a billion years. Here’s what this means . . .
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January 1 st The Milky Way Sun/planets Multicellular The Big Bang forms form organisms Life ( on Earth ) appears http://school.discovery.com The Earth is formed ~ 4.6 BYA First worms First amphibians First true mammals
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http://school.discovery.com First amphibians First true mammals
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Another analogy: If the Eiffel tower represents the history of the Earth , the time where we humans have been around can be shown as the coat of paint at the tower’s very tip . . . (This analogy was presented by no other than Mark Twain). Get the picture?
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http://www.earthsci.org This one is just fun . . .
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The Earth is about 4.6 billion years old The atmosphere of the early Earth is thought to have included: CO 2 , H 2 O, CO, H 2 , NH 3 , H 2 S, CH 4 . No free molecular oxygen (O 2 )!!!!! Many sources of energy: Lightning Volcanic activity Radiation (cosmic, UV)
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Chemical evolution of life ( Life from non- life ) – Different form biological evolution! For life to have arisen in this manner, it
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originoflife - The origin of life The age of the Universe...

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