Astronomy 2232F/G Lecture Notes - Lecture 1: Giant-Impact Hypothesis, Impact Crater, Canadian Shield
17 Jan 2018
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Document Summary
Earth and solar system formed 4. 5 billion years ago with impact events. No ocean basins or mountains on the moon just a planet that was formed exponential higher than today with steady state of impact events past. Lecture 1 impact cratering january 12th 2015. Impact events strike all over a planet not just at the equator (i. e. if object (cid:494)giant impact hypothesis(cid:495) )mpact crates dominate southern part of mars (cid:523)i. e. (cid:494)(ellus(cid:495) covers 2000 km was formed 4 million years ago it will receive thousands of impacts through times) Earth was hit by something the size of mars and earth and moon resulted. Elevation model of planet (red=high, blue=low) across- these large events occur very early in planets formation) form impact. High resolution camera can take pictures of desk-sized objects on mars. Oldest rocks occur in north america (2-3 billion years old canadian shield) that are not actively forming still, so not a lot of impact events.
