01:750:109 Lecture Notes - Lecture 25: Ablation Zone, Oort Cloud, Giant Planet
6 Dec 2018
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Document Summary
Indicates differentiation: rocky (resembles volcanic rock on earth) A few meteorites arrive from the moon and mars. A cheap (but slow) way to acquire moon rocks and mars rocks. Antarctica is the best place to find meteorites. Ice cap flows and deposits meteorites in an ablation zone (gets resurfaced) A major impact is only a matter of time: not if, but when. Extinction level events happen millions of years apart. Major damage happens tens to hundreds of years apart. Even if it"s in the middle of nowhere, gases can have effects on the atmosphere. Object that created the crater should be 1/10 the size of the crater. Fossil record shows occasional large dips in the diversity of species: mass extinctions. Most recent was 65 million years ago, ending the reign of the dinosaurs. Iridium is very rare in earth surface rocks but often found in meteorites.
