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Across
  1. 4. The spinning motion of a planet on its axis
  2. 7. the blocking of sunlight to earth that occurs when the moon is directly between the sun and earth
  3. 11. the tide with the least difference between consecutive low and high tides
  4. 12. the periodic rise and fall of the level of water in the ocean
  5. 14. A system of organizing time that defines the beginning length and divisions of a year
  6. 17. The movement of an object around another object
  7. 20. the scientific law that states that every object in the universe attracts every other object
  8. 21. the darkest part of a shadow
  9. 22. the partial or total blocking of one object in space by another
  10. 24. Either of the two days of the year on which the sun reaches its greatest distance north or south
  11. 26. A large round pit caused by the impact of a meteoroid
  12. 27. A ball of hot gas primarily hydrogen and helium that undergoes nuclear fusion
Down
  1. 1. The path of an object as it revolves another object in space
  2. 2. An object that orbits a planet
  3. 3. A loose collection of ice and dust that orbits the sun typically in a long narrow orbit
  4. 5. A pattern or grouping of stars that people imagine to represent a figure or object
  5. 6. The attractive force between objects the force that moves objects downhill
  6. 8. one of the different apparent shapes of the moon as seen from earth
  7. 9. A streak of light in the sky produced by the burning of a meteoroid in earths atmosphere
  8. 10. a chunk of rock or dust in space generally smaller than an asteroid
  9. 13. the blocking of sunlight to the moon that occurs when earth is directly between the sun and the moon
  10. 15. An imaginary line that passes through a planets center and its north and south poles about witch the planet rotates
  11. 16. the tide with the greatest difference between consecutive low and high tides
  12. 18. the part of a shadow surrounding the darkest part
  13. 19. dark flat areas on the moon surface formed from huge ancient lava flows
  14. 23. An object that orbits a star is large enough to have become rounded by its own gravity and has cleared the area of its orbit
  15. 25. Either of the two days of the year on which neither hemisphere is tilted toward or away from the sun