HONS 159 Lecture Notes - Lecture 7: Kuiper Belt, Oort Cloud, Earth Radius

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Published on 11 Dec 2018
The Cosmic Perspective Ch 7 - Our Planetary System
Solar System Overview
8 major planets
All orbiting in the same direction and plane
Distances between planets are large
3 dwarf planets
1 in asteroid belt
2 beyond Neptune’s orbit
Asteroid Belt
Between Mars and Jupiter
Kuiper Belt
Beyond Neptune
Oort Cloud
Farther than 10,000 AU
Comparative Planetology
Comparative planetology is the system of comparing objects in space to understand what
processes/effects occur on each and how that affects the final product, ex. How did Earth,
Venus, and Mars end up so different?
Mass of 333,000 mass of Earth
Radius of 108 Earth radii
Mostly made up of H & He gas
Energy comes from nuclear fusion in the core
Mass ~ 0.055 ME (ME - Mass of Earth, “~” = approximately)
Radius ~ 0.4 RE (RE - Radius of Earth)
0.4 AU from Sun
Mostly made up of metal (iron), rock (silicon)
No atmosphere
Very hot and very cold
Mass ~ 0.82 ME
Radius ~ 0.95 RE
0.7 AU from Sun
Mostly made up of metal and rock
Very large, thick atmosphere
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