Gravity

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Across
  1. 1. A giant ball of hot gas, mainly composed of hydrogen and helium.
  2. 3. A model of the Solar System that is sun-centered - _______ model
  3. 4. A model of the Solar System with the Earth in the center; created by the Greeks - _______ model
  4. 7. The spinning of Earth on its axis
  5. 8. 2x a year when the sun is at its greatest distance from the celestial equator
  6. 9. The path an object follows as it moves around another object
Down
  1. 1. An object that revolves around another object in space
  2. 2. An imaginary Line about which a body rotates
  3. 5. 2x a year when days & nights are equal lengths
  4. 6. The movement of an object around another object