Universe 1

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Across
  1. 2. Part of the solar system's belt
  2. 5. Any planet outside our solar system
  3. 6. Relating to the universe
  4. 7. Obscuration of light
  5. 10. Faster than light
  6. 13. My dream branch of science :)
  7. 14. The tendency to remain unchanged
  8. 16. One who studies the universe
  9. 17. Intense burst of solar radiation
  10. 18. Pluto's demotion
  11. 19. In terms of star systems, one with two suns
Down
  1. 1. The most abundant element in the universe
  2. 3. A meteor surviving its atmospheric passage
  3. 4. Perhaps the moon's best known features
  4. 6. Wonder-evoking term for the universe
  5. 8. Relating to the moon
  6. 9. Large systems of millions or billions of stars
  7. 11. When day equals night
  8. 12. Star shape
  9. 15. Duration of total obscuration in an eclipse