Lecture Summary 7

Lecture Summary 7 - Lecture Summary(10/19 10/21 Meteor...

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Meteor showers and their association with comets were discussed. The Perseids, Orionids, and Eta Aquarids were given as examples. It is evident from our observations of impact craters on planets and satellites that collisions have occurred throughout the Solar System and even in Earth's past history. Collisions have occurred in the past on Earth (examples: Meteor Crater, AZ). We began examining a theory using an asteroid impact to explain the mass extinction that occurred 65 million years ago. It is evident from our observations of impact craters on planets and satellites that collisions have occurred throughout the Solar System and even in Earth's past history. Collisions have occurred in the past on Earth (examples: Meteor Crater and Tunguska Event). It has been proposed that Earth suffered a climate altering (impact winter) collision with an asteroid or possibly a comet nucleus approximately 65 million years ago, which led to the mass extinction that included the dinosaurs. Why do scientists theorize that such an event happened? In 1980 Iridium in surprising amounts was detected in the K/T clay in Italy. (K/T refers to rock
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This note was uploaded on 02/01/2011 for the course ASTR 101 taught by Professor Deming during the Spring '07 term at Maryland.

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Lecture Summary 7 - Lecture Summary(10/19 10/21 Meteor...

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