Universe and Waves Crossword Puzzle

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Across
  1. 3. Distance between two waves from crest to crest or trough to trough
  2. 5. Wave with the shortest wavelength
  3. 6. The height of a wave
  4. 7. The motion of an object that orbits another
  5. 13. When a star or galaxy is moving towards earth
  6. 14. Systems of dust, gas, stars, and interstellar matter
  7. 16. A graph that organizes all stars based on luminosity and temperature
  8. 20. Tide after new or full moon (greatest difference)
  9. 22. Top of a wave
  10. 23. The brightness of a star
  11. 24. Unit of measurement for the frequency of a wave
Down
  1. 1. Bottom of a wave
  2. 2. End stage of supermassive stars or a big explosion
  3. 4. Most massive and luminous
  4. 5. The force that pulls matter together
  5. 8. Tide after quarter moons (least difference)
  6. 9. Longest or shortest day of the year
  7. 10. Substance that a wave passes through
  8. 11. A disturbance or variation that transfers energy
  9. 12. When a star or galaxy is moving away from the earth
  10. 15. Only part of the EM spectrum that the human eye can see
  11. 17. Wave with the longest wavelength
  12. 18. The number of waves that pass a given point
  13. 19. A large cloud of dust where stars are born
  14. 21. When the length of day and night are equal