Vocab

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Across
  1. 1. The measurement of the brightness of a light bulb
  2. 4. How long it takes light to travel
  3. 7. Different types of waves
  4. 11. The length of a wave
  5. 12. Bottom of the wave
  6. 13. How often a wave occurs
Down
  1. 2. How bright the stars look from Earth
  2. 3. An object used to see far away objects
  3. 5. The trough and crest together
  4. 6. Shift in position
  5. 8. The actual brightness of a star
  6. 9. A group of stars close together to form a shape
  7. 10. Top of the wave
  8. 11. The speed of a wave