ENV100Y5 Lecture Notes - Lecture 9: Solar System, Hadean, Volcanism
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How science is done: an aside on hypotheses // september 18, 2015. Age of the sun & solar system ~ 4. 57 billions of years (g. a/ b. a) Based on models of stellar evolution and on the dating of primitive solar system. Age of earth: 4. 54 billions of years. Based on ages of terrestrial rocks + age of solar system + models of solar system formation ex: again, meteorite that struck in new mexico called ayende. Early in earth"s history, plate tectonics were more vigorous and this is why finding a rock as old as the earth itself. Volcanism is a factor as well, the earth turns itself inside out. Intense uv radiation from sun (caused by no ozone layer) No free oxygen was immediately sucked up by carbon monoxide. No liquid water, too warm and would evaporate. The nebular hypothesis * explains the origin of the solar system:
