Across
- 3. the transfer of energy through matter or space as electromagnetic waves
- 7. the distance between any two corresponding points that are on a wave
- 11. a theory that says the universe began as a small point that expanded about 13.7 billion years ago
- 12. the death of a large star by explosion
- 13. a galaxy with very little symmetry
- 16. stars that spread out from the center of a spiral galaxy
- 18. change that allows us to determine if an object is moving toward us or away from us
- 19. center of a huge galaxy
- 20. an instrument that collects light and concentrates it for better observation
- 22. bands of dust that appear as dark ribbons
Down
- 1. all space and the matter space contains
- 2. electromagnetic waves that are between radio waves and infrared waves
- 4. how fast light travels
- 5. a unit of length equal to the distance that light travels through space in one year
- 6. electromagnetic waves with long wavelengths and low frequencies
- 8. a large grouping of stars
- 9. large cloud of gas and dust
- 10. electromagnetic waves with a shorter wavelength than visible light
- 14. provide us with visible light spectrum, the colors we see
- 15. electromagnetic waves that are used in medical applications
- 17. information obtained from experiments or observations
- 21. beginning point at which something begins