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Across
  1. 2. to spin in a central direction
  2. 7. the northern half of the earth
  3. 12. a day of equal sun and equal night
  4. 15. a pattern or group of stars that people imagine to represent a picture or animal or object
  5. 16. the slightly elongated circle that the earth travls around the sun
  6. 17. a cold mixture of dust and ice that leaves a long streak as it approaches the sun
Down
  1. 1. the southern half of the earth
  2. 3. a body that orbits a planet
  3. 4. something that is large enough to be rounded by its own gravity
  4. 5. a system of telling time by defining the beginning length and division
  5. 6. a giant ball of hot gases mainly composed of hydrogen and helium
  6. 8. the movement of one object around another
  7. 9. a streak of light produced when something enters our atmosphere
  8. 10. imaginary line that divides the earth in half
  9. 11. the longest and shortest days of the year
  10. 13. the spinning of the earth on its axis
  11. 14. the imaginary line that goes through the earth at the north and south pols