Solar System Physics 1

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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.
  3. Describe retrograd motion
    • 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.
  4. General facts about Sun
    • 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
    Image Upload 1

    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.
  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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Solar System Physics 1
Questions for university level astronomy-Solar system physics topic
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