# Solar System Physics 1

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 Author: Anonymous ID: 125759 Filename: Solar System Physics 1 Updated: 2012-01-03 13:13:21 Tags: Solar System Physic Folders: Description: Questions for university level astronomy-Solar system physics topic Show Answers:

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1. Describe the problems with the Geocentric model of the universe
• 1. The stars moved around a fixed Earth.
• 2. Could not explain retrofrad motion or phases of Venus.
2. Describe the Heliocentric model of the universe
• 1. Planets, including Earth, orbit the Sun.
• 2. Phases of Venus and retrograd motion coud be explained in this model.
• 1. Retrograde motion is when a planet appears to be moving backwards in it's orbit.
• 2. Copernicus reasoned that planets further away from the sun would move more slowly than closer ones. As a faster planet overtakes the Earth in their rotations, its motion against the stars, as seen from the Earth, reverses.
• 1. It's a star, a ball of (mainly) Hydrogen gas.
• 2. 700,000 km in radius.
• 3. Generates heat and light through nuclear fusion.
• 4. Surface temp. 5800K, central temp. 15 million K.
• 5. Hydrostatic equilibrium maintained between pressure and gravity.
5. Explain Hydrostatic Equilibrium

The pressure is not constant throughout a planetary atmosphere. A balance (equilibrium) is maintained between the outward pressure force and the inward gravitational force.
6. Hydrostatic Equilibrium equation?
• P(h)=Psexp(-µmHgh)
• kT
7. T or F: The orbits of the planets are elipses and lie in, or close to the eciptic plane.
True
8. State Newton's Univeral Law of Gravitation
Gravity is a force of attraction between all matter in the universe causing apples to fall from trees and the Moon to orbit the Earth.

• F=Gm1m2
• r2

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