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