Astronomy Billy

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Across
  1. 2. smaller than a universe
  2. 5. he created the law of motion
  3. 6. good telescope
  4. 7. northern star
  5. 13. really big boom
  6. 15. the study of the stars
  7. 16. discovered the four largest moons of Jupiter
  8. 18. how bright something is
  9. 19. Hemisphere not the northern hemisphere
  10. 20. pattern of something in the night sky
Down
  1. 1. in a popular constellation
  2. 3. magnitude the actual brightness
  3. 4. bright object with everything revolving around it
  4. 8. short day
  5. 9. choclate/home
  6. 10. used a long time ago to calculate the stars
  7. 11. measurement of speed
  8. 12. long day
  9. 14. year weird year
  10. 17. space company