Astronomy Crossword

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Across
  1. 5. collection of gas/dust
  2. 7. crash to earth
  3. 11. mercury,venus,earth,mars
  4. 13. changing direction of earth axis
  5. 15. jupiter,saturn,uranus,neptune
  6. 16. smaller piece of rock and metal
  7. 17. study of the universe
  8. 19. stellar explosion at end of stars life
Down
  1. 1. chunk of ice,dust and rock
  2. 2. plants like pluto,haumea,makemake
  3. 3. revolves around earth
  4. 4. composed of rock and metal
  5. 6. cloud of gas and dust
  6. 8. burn in earths atmosphere
  7. 9. hottest part of sun
  8. 10. study of objects beyond earth
  9. 12. revolves around sun
  10. 14. dark surface spots that are cooler than surrounding area
  11. 18. produces their own light