ASTRON 103 Lecture Notes - Lecture 4: Lunar Mare

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11 Apr 2018
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Last class Thursday March 8
2min video due March 6 (electronic submission)
Moon Project due March 8 (electronic submission)
- Core that is iron
- Fast
Venus:
- Rotation period: 243d in one rotation on its axis
- 90 bar atmospheric pressure
- Sun rises in west and sets in east
- Only has two northern and southern convection cells since rotation is so slow
- 400 degrees celsius as result from the greenhouse effect
- Relatively flat: different type of plate tectonics than Earth
- 500m years as surface of venus has only 15% the number of craters as the lunar maria
- Undergoes “flake” tectonics where convection is much more intense and surfaces
brakes into flakes
Mars:
- Small radius and mass
- Atmospheric pressure is 0.007 bar
- Low pressure: water essentially evaporates right away
- Bifurcation of lowlands and highlands on mars between two hemispheres
- Mars has very thick crust: no plate tectonics happening as far as we know
Earth, Venus and Mars all in same habitable zone
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