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