Astronomy Crossword puzzle

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Across
  1. 1. / A very small star
  2. 6. / A mass of material with a long tail that travels around the Sun
  3. 8. / The name of our galaxy
  4. 11. / A group of stars with a definite pattern or arrangement
  5. 13. / The planet closest to Earth
  6. 16. / Small rocky objects that revolve around the sun, mostly in the area between Mars and Jupiter
  7. 17. / A star much larger than our sun
  8. 19. / The largest planet in our solar system
  9. 20. / Number of stars in the Big Dipper
Down
  1. 2. / The movement of the Earth around the Sun
  2. 3. / A scientist who studies stars and planets
  3. 4. / The distance light travels in one year
  4. 5. / The planet with rings
  5. 7. / The planet closest to the Sun
  6. 9. / An instrument that makes distant objects look larger and closer
  7. 10. / A star's brightness is called its ______.
  8. 12. / Another name for the North Star
  9. 14. / The spinning of the Earth on its axis
  10. 15. / A large group of stars, gas and dust
  11. 18. / The "Red Planet"