Across
- 8. object which light cannot escape
- 9. electromagnetic waves
- 11. bulge in the center and very long "arms" winding around the center
- 13. all space and matter space contains
- 15. that does not fit in any category
- 17. electromagnetic waves that are very high energy
- 19. Earth and other planets orbit
- 20. electromagnetic waves that are very high energy and no mass or charge
- 21. provide us with visual light
Down
- 1. bands of dust that appear as dark ribbons
- 2. death of a star with explosion
- 3. large cloud of gas and dust
- 4. which we live
- 5. transfer of energy
- 6. electromagnetic waves that are between radio waves and infrared waves
- 7. rotational center of a huge galaxy such as the Milky Way
- 10. bright center and little dust and gas
- 12. large grouping of stars in space
- 14. distance between 2 corresponding points
- 15. waves with longer wavelengths
- 16. change in wavelength
- 18. held together by its own gravity