Across
- 2. stars that spread out from the center of a spiral galaxy
- 5. the universe began as a small point and expanded rapidly
- 7. bands of dust that appear as dark ribbons against bright stars
- 10. rotational center of a huge galaxy
- 12. all space and matter space contains
- 13. waves between radio and infrared waves
- 14. light travels at 300,000km/sec
- 16. standard unit to compare the size of stars with our Sun
- 18. large group of stars in space
- 19. self lumnious body of gas
- 20. provide us with the colors we see
- 21. large cloud of gas
Down
- 1. the death of a large star by explosion
- 3. information taken from experimnets
- 4. a galaxy that does not fit into any category
- 5. a ball only 10 km across and strong gravity
- 6. beginning which something begins
- 8. instrument that collects light
- 9. a representation of an object
- 11. electromagnetic waves with longer wavelenghts than visible light
- 15. the transfer of energy
- 17. the distance that light travels through space in a year