Astronomy Revision

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Across
  1. 5. Collection of galaxies, nebulae and stars
  2. 7. Theory that describes start of expanding universe
  3. 8. A unit of distance
  4. 9. Scientist who studies origin of universe
  5. 10. Slow motion of stars is due to earth's ________
  6. 11. Nursery of stars
  7. 12. Graph of absolute magnitude versus temperature
  8. 16. Effect describing relative motion
  9. 17. Law about distant galaxies moving faster away from earth
  10. 18. Magnitude 1 is _______ than 6
  11. 20. Planet outside the solar system
  12. 25. Brightness as seen from the earth
  13. 26. Mass of sun compared to other stars
  14. 28. Astronomer who suggested the geocentric model
  15. 29. Light displays in upper atmosphere
  16. 30. Famous telescope that collects data
Down
  1. 1. Energy emitted from sun as a result of nuclear _________
  2. 2. Shift due to movement of stars away from earth
  3. 3. Colour of stars is determined by this
  4. 4. Sun at the centre of this model
  5. 6. Age of universe is 15 _____ years
  6. 13. Earth at the centre of this model
  7. 14. End stage of a massive star
  8. 15. Actual brightness
  9. 19. Group of stars
  10. 21. Cloud of dust and gas
  11. 22. Effect that explains why frequency changes for a moving siren
  12. 23. Cooler patch on the sun
  13. 24. Brought atoms together for form stars
  14. 27. Part of sun visible during a solar eclipse