Our place in space

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Across
  1. 1. Time when a half of earth isn't facing the sun (5)
  2. 4. Built a telescope, viewed the solar system and challenged geocentrism (7)
  3. 6. Season when the half of earth is tilted away from the sun (6)
  4. 7. Season when the half of earth is tilted towards the sun (6)
  5. 10. Earth rotates around its __________ (4)
  6. 11. Caused by the axial tilt of the earth (7)
  7. 14. Model of the solar system with the sun at the centre (12)
  8. 16. Path a planet takes around the sun (5)
Down
  1. 2. Model of the solar system with Earth at the centre (10)
  2. 3. Time it take earth to rotate around its axis (3)
  3. 5. The top/bottom halves of the planet (10)
  4. 8. The amount of matter something has (4)
  5. 9. Jupiter and Saturn are examples of this type of planet(8)
  6. 12. An imaginary line going around the middle of earth (7)
  7. 13. Time it takes for a planet to revolve (travel) around the sun (4)
  8. 15. A force due to mass, creates orbits and holds us to earths surface (7)