Secrets of the Universe

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Across
  1. 4. the fate of most normal stars
  2. 5. when Earth is closest to the Sun
  3. 6. tides that occur at the full Moon
  4. 9. caused by a change in wavelength
  5. 11. closest planet to the Sun
  6. 13. the first person to use the phrase "Big Bang"
  7. 14. the nearest galaxy to our own
  8. 16. the distance travelled by light in a year
  9. 17. a magnificent collapse of a giant star
  10. 18. our Sun is this type of star
  11. 21. the biggest planet in our solar system
  12. 22. the final stage of a massive star
  13. 23. the theory that explains the beginning of the Universe
Down
  1. 1. a pattern of stars in the night sky
  2. 2. hardly any moon at all
  3. 3. where most stars can be found on the HR diagram
  4. 7. the nearest star to Earth
  5. 8. a planet that revolves clockwise
  6. 10. where stars are born
  7. 12. created the HR diagram with Russell
  8. 15. equal to the distance from the Earth to the Sun
  9. 19. first to notice galaxies were moving away from us
  10. 20. 'fish tred' - what you need to speed away