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Lecture 7

Astronomy 1021 Lecture 7: Astronomy – Chapter 7


Department
Astronomy
Course Code
ASTR 1021
Professor
Robert Cockcroft
Lecture
7

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Astronomy Chapter 7 Outcomes
Name the terrestrial planets and their moons; give their masses and orbital semi-major
axes (relative to that of the Earth) to one significant figure
Mercury
- Moons: 0
- Mass: 0.55Mearth
- Semi major axis: 0.387 earth
Venus
- Moons: 0
- Mass: 0.82Mearth
- Semi major axis: 0.723 earth
Earth
- Moons: 1
- Mass: 1Mearth
- Semi major axis: 1 earth
Mars
- Moons: 2 (very small) Phobos and Deimos
- Mass: 0.11Mearth
- Semi major axis: 1.524 earth
Explain the steps in terrestrial planet formation
Terrestrial Planet Geological and Atmospheric Formation
- Three main areas we want to focus on when looking at terrestrial planets
1. Interior
2. Surface
3. Atmosphere
Interior
- Three regions
1. Core (metals) (solid inner, liquid outer)
2. Mantle (oxygen)
3. Crust (granite)
Seismic Waves
- Result from earthquakes, volcanic eruptions,
landslides
- Most direct way to measure interior
- We can infer the density structure of Earth’s interior by using seismic waves
- Studying these waves tells us what the Earth’s interior looks like
- There is some seismic activity on moons as well
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