ESTB01H3 Lecture Notes - Lecture 4: Homeostasis, Risk Society, Stoicism
6 Dec 2016
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Eesb01h3 f: lecture 4 - history of nature. The cretaceous-tertiary extinction event occurred about 66 million years ago. It was a mass extinction of of plant and animal species on earth. In the geological record, this period is marked as the k boundary, a thin layer of sediment. The clay in the sediment shows high levels of a metal, which are rare in the. Scientists were also able to observe a comet colliding with jupiter. Non-avian dinosaur fossils can only be found below the k boundary of sediment. Statistically speaking, humans are on their way out. Nemesis is a dwarf star, which orbits the sun and occasionally stirs up cometary debris. Scientists speculate that the star is able to affect the orbit of planets in the outer solar system, sending them on a collision course with earth. Muller believes that there is a 62 million-year cycle for mass extinction, plus or minus 3 million years.
