Space Crossword! Part Two

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Across
  1. 3. Certain specific wavelengths within a spectrum shown as lines
  2. 4. A star’s total energy output per second
  3. 6. The event that may have triggered the expansion of the universe
  4. 7. The theory that describes how stars and planets form
  5. 9. A small, dim, hot star
  6. 10. The small group of galaxies that include our galaxy the Milky Way
  7. 11. A form of energy that makes up almost three quarters of the universe that increases the expansion of the universe
  8. 12. The surface layer of the sun
  9. 14. A massive explosion in which the entire outer portion of a star is blown off
  10. 15. An optical instrument that produces a spectrum from a narrow beam of light
  11. 18. The process of energy production in which hydrogen nuclei combine to form helium nuclei
  12. 20. A graph that compares the properties of stars
  13. 22. A star that is so dense that only neutrons can exist in its core
  14. 23. An area of strong magnetic fields on the photosphere of the sun
  15. 24. A vast cloud of gas and dust
  16. 25. The most abundant invisible form of matter in the universe
Down
  1. 1. The study of the universe
  2. 2. The radiation left over from the big bang
  3. 5. A large cluster of 4 to 25 clusters of galaxies
  4. 7. A stream of fast moving charged particles produced by the sun
  5. 8. A narrow band of stars on the H-R diagram
  6. 11. The change in frequency of a light or sound source due to its motion relative to an observer
  7. 13. A celestial body made of hot gases
  8. 16. A collection of up to 50 to 1000 stars
  9. 17. A hot, condensed object at the center of a nebula
  10. 19. A huge collection of stars, planets, gas, and dust all held together by gravitational forces
  11. 21. A collection of stars held together by gravity