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UA - PH/AY 101 - Class Notes - Week 8

Created by: Abby Kunis Elite Notetaker

UA - PH/AY 101 - Class Notes - Week 8

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background image Ay101 lecture notes  10/4/2016   Asteroid and Kuiper Belts: leftovers 
Asteroids:
- mainly rock/metal like terrestrial worlds  - spaced far apart (70 km between neighbors) Pluto and Charon: - new horizons spacecraft flew past July, data from flyby slowly coming in 
(will be for years) 
- Universal expectation: too small, too little tidal forces to keep insides 
molten. Ought to be dead worlds covered in craters.
Comets: - sometimes outer solar system objects get perturbed into orbits that 
approach the sun 
- when we measure their orbits, most go out to either… 50-100 AU (Kuiper 
belt) or about 100,000 AU (oort cloud) 
- tails formed by gases that sublimate off the nucleus, small dirt grains that 
come out. 
- pushed away from the sun by solar wind.  Meteor showers: - if earth passes through the former path of a comet, the dirt grains burn 
up in our atmosphere. 
- Best meteor showers: August 12th (Persieds; comet swift-tuttle), 
November 17th (Leonids; comet tempel-tuttle)
Formation of the Solar System:
~Key observations:
-
terrestrial vs. jovian planets 
-flat plane with mostly circular orbits 
-most orbits and rotation are in the same direction 
Protosolar Nebula: - collapsing very- slowly-spinning gas cloud           ~turns gravitational potential energy into thermal energy (Heats Up)
          ~ conserves angular momentum as it gets smaller (spins up and                  
flattens) 

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School: University of Alabama - Tuscaloosa
Department: Astronomy
Course: AY 101 - Intro to Astronomy - Jeremy Bailin
Professor: Jeremy Bailin
Term: Spring 2015
Tags:
Name: ay101 lecture notes 10/4
Description: todays lecture notes
Uploaded: 10/04/2016
2 Pages 14 Views 11 Unlocks
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