Model of the universe

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Across
  1. 3. All of our planets make up this
  2. 4. A Greek mathematician and astronomer
  3. 6. the theory sun is the center of the universe and the earth rotates its axis
  4. 8. means the sun is at the middle of the universe
Down
  1. 1. The basic words of this concept are function, classification, and hierarchy
  2. 2. The theory that The Earth is the center of the universe and is stationary
  3. 5. What is the earth called
  4. 7. Added contributes to astronomy, mathematics, geography, musical theory, and optics