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UA - PH/AY 101 - AY 101: Exam 2 Week 6 (Part 1) Lecture Notes - Class

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UA - PH/AY 101 - AY 101: Exam 2 Week 6 (Part 1) Lecture Notes - Class

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background image AY 101 Exam 2: Week 6   (Tues., Feb. 21  Only) - Finishing up from last week: UV light doesn’t make it through Earth’s 
I. Terrestrial Planets: Mercury, Venus, Earth, Mars
a. These planets share many similarities:
i. Made from “Terra” (dense solids like rock/metal). 1. Closer to center, more dense material. Farther from  center, less dense material. b. All terrestrial planets were molten at one point…but how do we know  this? i.  Demo: Mallet in pitcher of water. We see that because the  mallet sinks to bottom, there must have been a surface 
soft/liquid/molten enough for denser materials to sink to core of 
planets as well.
ii. We can judge the internal structure of a far-off object by  vibrations and soundwaves within the planet.  1. Think: You can tell whether a ball is solid or hollow by  judging the noise it makes when you tap on it. a. Soundwaves can travel through both liquids and  solids, but some (transverse) can only travel 
through solids.
II. Physical Processes
a. Planetary sizes influence heating and cooling. 
i. For larger planets, the heat rises faster than the cooling rate,  i.e., larger planets will cool and solidify slower than smaller 
III. The Sun & Greenhouse Effect
a. Of course, the closer a planet is to the sun, the more energy it 
receives, and the hotter surface it has.  b. In the absence of the Greenhouse Effect, Earth would be too cool to  hold liquid water. c. The Greenhouse Effect holds heat through the main Greenhouse  gasses (water vapor, CO2, methane) and raises the temperature of the
Earth, allowing us to have liquid water. 
i. Greenhouse gasses allow visible light through, but block UV  light. 

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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: astronomy and planets
Name: AY 101: Exam 2 Week 6 (Part 1) Lecture Notes
Description: Here are the notes from Dr. Bailin's lecture from Tuesday, Feb. 21st.
Uploaded: 02/22/2017
1 Pages 15 Views 12 Unlocks
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