Astronomy

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Across
  1. 2. how many planets orbit the sun
  2. 5. biggest planet in the solar system
  3. 7. a small body of mass when it hits the ground
  4. 9. planet that is tilted on its side
  5. 10. most inner layer of the sun
  6. 11. fourth planet from the sun
  7. 13. snowball like objects that orbit the sun
  8. 14. a small body orbeting the sun
  9. 17. the most outer layer of the sun
  10. 18. Earth is the ...... planet in the solar system
Down
  1. 1. the smallest planet in the solar system
  2. 3. unit of measurement used
  3. 4. what is the furthest planet in the solar system
  4. 6. the study of celestial bodies
  5. 7. what is the densest planet in the solar system
  6. 8. the sun is how many billion years old
  7. 11. a small body of mass that enters earth atmposphere
  8. 12. when the sun ejects matter
  9. 15. center of our solar system
  10. 16. Pluto is a ...... planet