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Lecture 13

ASTRONOMY LECTURE 13

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Department
Astronomy
Course Code
ASTR 100
Professor
Govindrajan

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ASTRONOMY LECTURE 13 9/25/13 Solar System Overview & Other Planetary Systems 1. Universe started out as hydrogen and helium 2. Two Tools for planet studying a. Mean Density i. MD=total mass/total volume ii. Moon, Jupiter, Saturn all less dense than earth b. Half­Life and Radioactive Dating i. Weak Nuclear force ii. Radioactive force controls the unstable nuclei in an elements decay 3. Four Basic Forces of Nature a. Gravity b. Electro Magnetic c. Strong Nuclear Force d. Weak Nuclear Force 4. Comparisons between planets a. Mass b. Mean Density c. Atmospheric Properties d. Albedo (percent of light reflected by the planet e. Number of moons 5. Ratation of planets are all counter­clockwise direction a. As seen from above earths north pole 6. View of planets from edge­on are all on a flat plane 7. Formation of solar system models a. Concepts are not fully developed b. Start with a disk of gas and dust orbiting around the proto­sun c. Condensation process in this disk can be studied in the chemistry of  meteorites d. Dust grains and pebbles coalesce into planetesimals
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