The Astronomers Crossword

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Across
  1. 1. Lost the bridge of his nose in a sword fight over an argument
  2. 4. The person who developed the laws of planetary motion
  3. 6. Created the earliest description of the workings of the Solar System
  4. 8. An early model of the solar system that placed the sun in the center
  5. 9. Calculated that 2 separate comets recorded at 76-year intervals were the same
  6. 11. He was an ancient Greek astronomer who proposed a heliocentric model
  7. 12. This person created the celestial sphere
Down
  1. 2. Discovered the planet Uranus in 1781
  2. 3. An early model of the solar system with Earth at the center
  3. 5. This civilization created many new devices for observing the sky
  4. 7. The first person to use a telescope to observe the sky
  5. 10. This astronomer developed the theory of universal gravitation