Post on 21-Dec-2015
Review 1
Astronomy 150, April 25th 2005
Phase diagrams
• Phase diagrams – describe state of a material• How cold would you have to make this room so that CO2 would be solid?
– Decrease temperature below -78 degrees Celzius• How would you change the conditions of this room so that CO2 could exist
as a liquid?– Increase pressure above 5.1 atm and temperature between -56.5 and -31 C
Vocabulary
• Densities– Water (ice) = 1 g / cm3
– Rocks = 3 g / cm3
– Iron = 8 g / cm3
• Mercury 5.4 g / cm3
– Rocks and iron
• Jupiter 1.3 g / cm3
– NOT made of ice!
• Moment of inertia factor K– Uniform sphere K = 0.4– Mass more concentrated in
the center K < 0.4 planet is differentiated
The Moon
The Moon• Regions:
a) Mareb) Highlands
• Mare– Albedo: low– Age: young (How do we measure age?)– Crater density: low– Main feature: lava flows– Primary rock type: basalt (low albedo)
• Highlands– Albedo: high– Age: old– Crater density: high– Main feature: impact craters– Primary rock type: impact breccias, highland pristine rocks
The Moon
• Impact processes:– Simple impact craters– Complex impact
craters mounds how do they form?
– Impact basins when were they formed?
The Moon
Rocks