Astronomy Crossword Puzzle

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Across
  1. 5. the amount of time light travels in a year
  2. 7. the line where sky and the earth appear to meet
  3. 9. sections of the sky that contain recognizable patterns
  4. 11. 1687, all objects in the universe attract each other
  5. 12. Amount of time it takes a planets to rotate on its axis
  6. 13. 1597, Denmark sun and moon revolve around earth, stars revolve around the sun
  7. 15. amount of time it takes the moon to revolve around the sun
Down
  1. 1. the angle between an object in the sky and the horizon
  2. 2. amount of time it takes for the earth to revolve around the sun
  3. 3. 1543, poland, believed in sun centered universe
  4. 4. 1609,Demark,planets revolve around the sun
  5. 6. 140 CE, Greece, believed in earth centered universe
  6. 8. the point in the sky directly above an observer
  7. 10. path an object follows as it travels in space
  8. 14. to go around another body in space