Models of the Solar System

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Across
  1. 2. Discovered that planets orbit on ellipse.
  2. 5. Man able to work out the arrangement of the known planets and how they move around the sun.
  3. 6. The model type that has the sun as its center.
  4. 8. Man that said the planets moved in small circles carried along in bigger circles.
Down
  1. 1. The model type that has Earth as its center.
  2. 3. An oval shape.
  3. 4. Planet that Galileo discovered had four moons.
  4. 7. Man that discovered that gravity and inertia working together explained the motions of planets and their moons.