Across
- 4. lowest point on a wave
- 6. waves with the shortest wavelength and highest energy
- 8. season with longer nights
- 9. giant cloud of dust and gas where new stars form or the shell of gas leftover from a dying star
- 11. causes daily tide changes
- 12. highest point on a wave
- 14. area in space that is so dense that nothing, including light, can escape its gravitational pull
- 15. measure of the amount of energy a wave carries
- 16. unit of distance equivalent to the distance light travels in one year
- 17. rise and fall of ocean water levels
- 18. graph that plots luminosity v. temperature of stars
Down
- 1. season with longer days
- 2. total amount of light energy it gives off each second
- 3. huge ball of gas that generates light energy through fusion of hydrogen
- 5. waves with the longest wavelength and lowest energy
- 7. the Milky Way is this type of galaxy
- 8. distance from one crest of a wave to the next crest
- 10. a huge collection of gas, interstellar dust, and stars held together by gravity
- 13. scale used for temperature of stars