Astronomy Crossword puzzle

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