Across
- 2. number of waves per unit of time
- 4. how scientist measure stars
- 7. how far light travels in a year
- 8. the speed at which a wave from a progressive wave travels
- 9. a spectra with the waves and colors
- 13. the time for a particle on a medium to make one complete vibrational cycle.
Down
- 1. a group of stars that make a shape in the sky
- 3. a movement that containes a trough and a crest
- 5. lowest part of a wave
- 6. how bright a star looks
- 8. the distance between successive crests of a wave
- 10. how bright a star is
- 11. highest part of a awave
- 12. massive, luminous sphere of plasma held together by gravity in the sky