Astronomy 1021 Lecture 23: W23L Life in the Universe
4 Oct 2018
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Document Summary
Probability earth is the only planet with life is very low. Carbon ( c ) is a social element. Relics or organisms that lived and died a long time ago. Fossils in older rocks become increasingly difficult to recover. May have resembled that bacteria today found near deep ocean volcanic vents (black smokers) and geothermal hot springs. Oct 2015, western australis: life on earth 4. 1 billion years ago. March 2017: nuvvuagittuq belt of quebec: life on earth 4. 28 billion years ago. Fossils showed evolution had occurred, darwin explained how (1859) Deoxyribonucleic acid (dna is the molecule that holds life"s information. Evolution occurs because of mutations (random difference in dna patterns) Mutations are random: could be good or bad. A squirrel with a heavier coat of fur will, on average survive longer and produce more offspring than its normal contemporaries- similarly for offspring. Animals are only a small subset of life as we know it.
