Astronomy Lecture Notes 18

9 ast 101 uoft dr matzner 10 the asteroids ast

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Unformatted text preview: 01 | UofT | Dr. Matzner | 10 The Asteroids AST 101 | UofT | Dr. Matzner | 11 Finding the Asteroids: AST 101 | UofT | Dr. Matzner | 12 Clicker Quiz, 1 min. Where do the gaps in the Asteroid Belt come from? A: B: C: D: Collisions between planets create asteroid rings Orbital resonances with Jupiter open gaps Orbital resonances with Mars open gaps Planets within these gaps shepherd the rings AST 101 | UofT | Dr. Matzner | 13 Hole in ceiling AST 101 | UofT | Dr. Matzner | 14 Sometimes your meteorite comes from the Moon, or Mars! This Martian meteorite started a debate... does it contain evidence of past life on Mars? U.S. President Bill Clinton describing its possible importance in 1996 AST 101 | UofT | Dr. Matzner | 15 Primitive meteorites But most of them come from the Asteroid Belt: Stony Carbon-rich Processed meteorites Metalrich Rocky AST 101 | UofT | Dr. Matzner | 16 Clicker Quiz, 1 min. Why are there both rocky and metal-rich “processed” meteorites? A: They come from the mantles and cores of differentiated protoplanets. B: They come from different regions of the Solar Nebula. C: They are built from different sorts of dust grains. AST 101 | UofT | Dr. Matzner | 17 Strange news from the early Solar System Meteorites contain long-lived radioactive atoms like Uranium-235, which show that the Solar System formed 4.567 billion years ago. These elements were made in exploding stars long before the Sun was formed. Meteorites also once contained short-lived radioactive atoms, like: Aluminum-26 (half-life 0.7 million years) and Iron-60 (half-life 2.6 million years), which must have been made right before the Solar System formed. AST 101 | UofT | Dr. Matzner | 18 Stars massive enough to quickly explode Smaller stars like the young Sun with its Solar Nebula AST 101 | UofT | Dr. Matzner | 19 Objects in the Kuiper Belt Discovery of Pluto (predicted!) AST 101 | UofT | Dr. Matzner | 20 Objects in the Kuiper Belt Discovery of Pluto (predicted!) AST 101 | UofT | Dr. Matzner | 21 Objects in the Kuiper Belt Discovery of Eris (2003) AST 101 | UofT | Dr. Matzner | 22 AST 101 | UofT | Dr. Matzner | 23 Nix Hydra AST 101 | UofT | Dr. Matzner | 24 The Orbit of Sedna AST 101 | UofT | Dr. Matzner | 25 AST 101 | UofT | Dr. Matzner | 26...
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This note was uploaded on 09/12/2013 for the course AST 200 taught by Professor Dr.p during the Spring '12 term at University of Toronto.

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