Astronomy Criss-Cross

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Across
  1. 2. believed in a sun centered universe
  2. 4. farther objects to earth appear blue
  3. 5. amount of time a planet takes to rotate on its axis
  4. 7. the time it takes the moon to rotate around the earth one full time
  5. 9. believed in an earth centered universe
  6. 11. motion of an object as it goes around another body in space
  7. 12. path an object follows as it travels around another body in space
  8. 13. stars you can see all year long, at N+S poles
  9. 15. found that all galaxies are affected by red shift except close neighbours
  10. 16. Spin of an object on its axis
  11. 17. a group of stars in a region of the sky
Down
  1. 1. imaginary point in the sky, directly above observer
  2. 3. distance light travels in a year
  3. 6. angle between object and horizon
  4. 8. created laws of motion,found gravitational force
  5. 10. time it takes a planet to revolve around the sun
  6. 11. closer objects to earth appear red
  7. 14. line where sky and earth meet