Models of the Solar System

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Across
  1. 3. Greek astronomer who said planets moved in small circles carried along in bigger circles.
  2. 6. Model system where the Earth and other planets revolve around the sun.
  3. 7. Discovered Jupiter's four moons and proved not everything revolved around Earth.
Down
  1. 1. Discovered that planets orbit in ellipse.
  2. 2. Person who figured out the arrangements of the known planets and how they moved around the sun.
  3. 4. Model system where the Earth is at the center of the revolving planets and stars.
  4. 5. An oval shape