Across
- 1. Celestial body which Earth and other planter revolve around.
- 2. Vast arrangement of electromagnetic waves.
- 4. Waves with longer wavelengths than visible light.
- 7. A mass of gs held together by its own gravity.
- 8. Waves with long wavelengths and low frequencies.
- 10. Distance between any Two corresponding points.
- 12. Information obtained from experiments or observations.
- 13. Death of a large star by explosion.
- 15. Large cloud of gas and dust.
- 17. Unit of length equal to the distance traveled by light in 1 year.
- 18. Large group of stars.
- 19. Rotational center of a huge galaxy.
- 20. Used in Astronomy to compare the size of other stars with our sun.
Down
- 1. How fast light travels.
- 2. Electric and magnetic waves that travel at the speed of light.
- 3. The transfer of energy through matter or space.
- 5. An instrument that collects light or other electromagnetic radiations.
- 6. Provides us with visible light.
- 9. Beginning point at which something begins or which it derives.
- 11. Bands of dust that appear as a dark ribbon.
- 14. Electromagnetic waves that are between radio and infrared waves.
- 16. All space and the matter space contains.