Across
- 3. how fast light travels
- 5. transfer of energy through space
- 7. big ___ theory: theory states the universe was created 13.7 billion years ago
- 8. instrument used to study space
- 14. arrangement of waves in relation to wavelengths
- 18. beginning point when something begins or is created
- 20. the sun is one of these
- 21. infrared ___: waves with longer wavelengths than light
Down
- 1. waves with long wavelengths and low frequency
- 2. large group of stars
- 4. center of a galaxy
- 6. object in space with very strong gravity that light can not escape
- 9. the planets orbit around this star
- 10. large explosion caused by star death
- 11. distance between two points on an adjacent wave
- 12. all space and matter space contains
- 13. bands of dust that appear like dark ribbons
- 15. ___ shift: the change in wavelength
- 16. scientific ___: information obtained from experiments or observations
- 17. ___ year: nearly 9.5 trillion miles
- 19. x-___ waves of very high energy