Across
- 1. speed The speed of a wave
- 4. How fast a wave is going up and down
- 5. parallex A way to find a near star's distance
- 8. A ball of fire
- 9. brightness How bright a star appears
- 10. The length of a wave
- 12. How bright a star is
Down
- 2. spectrum Has different types of waves
- 3. The closest star to Earth
- 6. The top of a wave
- 7. The bottom of a wave
- 11. way The galaxy we live in
- 12. year The distance light travels in a year