Earth Sciences 1086F/G Lecture Notes - Lecture 7: Milky Way, Binary Star, Stromatolite
8 Dec 2017
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Document Summary
Chapter 19 life in the universe 1. The origin of life on earth 2. Earth: there are plenty of other possibly habitable exoplanets outside the solar system, too far to reach with our current technology. Overview: living matter utilizes energy from its environment to survive and create offspring, viruses are not living as they cannot live without host cells. In our world, all organisms that have the essential characteristics of life are made up of cells: ability of life to reproduce and self-regulate is based on interactions between nucleic acids and proteins. Building carbon creatures: all earth life is carbon based, because of the way carbon atoms bond to other atoms, it can form complex chains capable of utilizing energy. 2017-12-05: silicon is 135x more common on earth than carbon, but there are no silicon creatures in existence. The origin of life on earth: oldest fossils hint that life began in the sea.
