Across
- 5. space and the matter space contains
- 6. how fast light travels 300,000km/sec
- 8. a self-luminous celestial body consisting of gas
- 9. electric,magnetic waves travel at speed of light
- 16. instrument that collects light
- 18. transfer of energy through matter or space
- 19. waves with long wavelengths and low frequencies
- 20. a large grouping of stars in space
- 21. celestial body which earth and other planets revolve
Down
- 1. provide us with visible light spectrum
- 2. information obtained from experiments
- 3. distance between any two corresponding points
- 4. bands of dust that appear as dark as ribbon
- 6. stars that spread from center of spiral galaxy
- 7. universe began as a small point
- 10. waves with longer wavelengths than visible light
- 11. large cloud of gas and dust
- 12. distance that light travels through space in 1 year
- 13. waves with very high energy and no mass
- 14. waves between radio waves and infrared waves
- 15. death of a large star by explosion
- 17. point where something begins