Across
- 2. the distance between any two corresponding points on a wave
- 3. a theory that states that the universe expanded rapidly about 13.7 millions years ago
- 6. large cloud of gas and dust in space
- 8. a unit of length equal to the distance that light travels through space in 1 year
- 9. a point at which something begins
- 10. a large grouping of stars in space
- 11. transfer of energy through matter or space as electromagnetic waves
- 13. an instrument that concentrates light or electromagnetic radiation for a better observation
- 14. stars that spread out from the center of a galaxy
- 15. unifying scientific explanations for a broad range of hypotheses
- 17. electromagnetic waves that have a very high energy
- 19. the change in a wavelength
- 20. all space and matter space contains
- 21. a celestial body consisting of a mass of gas
Down
- 1. electromagnetic waves with long wavelengths
- 4. electromagnetic waves with a very high energy and no mass or charge
- 5. vast arrangement of electromagnetic waves
- 7. provides us with visible light spectrum
- 12. the death of a large star by explosion
- 14. a unit to compare the size of other stars to the Sun
- 16. how fast light travels
- 18. celestial body in which the earth and other planets revolve