Across
- 2. way the spiral galaxy containing our solar system. With the naked eye it is observed as a faint luminous band stretching across the heavens, composed of approximately a trillion stars, most of which are too distant to be seen individually
- 5. the top of the wave
- 6. a self-luminous heavenly body; star.
- 7. spectrum The Em spectrum is the complete spectrum of light including radieo waves,visable light, x rays
- 11. brightness how bright the light is
- 13. parllax a way to messure stars by using the near stars
Down
- 1. year how fast light can travel in one year
- 3. the length of a wave
- 4. the rate of both top and botem of the wave momvent
- 8. the total britness
- 9. the bottem of the wave
- 10. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night
- 12. speed how fast the wave is moving