Astronomy Crossword Puzzle

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Across
  1. 5. A system of stars and dark matter
  2. 11. Consist of the sun and planets
  3. 12. Shortest day of year
  4. 13. The distance that light travels in a year
  5. 14. A way of expressing very large or small numbers
  6. 15. Around the sun is an ellipse
  7. 16. A cold mixture of dust and ice
  8. 20. Meteorite that passes through the earth surface
  9. 21. The leading explanation for how the universe began
  10. 22. Occur when either the Northern or Southern Hemisphere is at its strongest
  11. 23. To make an educated guess
Down
  1. 1. The force that pulls an object together
  2. 2. An object that orbits Earth
  3. 3. Is the tendency of an object to resist a change in motion
  4. 4. To help describe earths movement
  5. 6. Small mostly rocky bodies that orbit inner solar system
  6. 7. Celestial body that orbits around Sun
  7. 8. A sun centered model
  8. 9. "Equal nights"
  9. 10. Is the movement of one object
  10. 14. A giant ball of overheated
  11. 17. Passage of a meteoroid, comet, or asteroid entering Earth's atmosphere
  12. 18. An oval shape
  13. 19. An earth centered model
  14. 20. Chunks of dust or rocks