Stars & Galaxies

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Across
  1. 1. round or flattened balls; contain only old stars
  2. 6. instrument that can spread the light into different wavelengths
  3. 7. range of wavelengths that stars emit
  4. 9. lifetime of a star depends on this
  5. 12. contracting gas and dust forms a large cloud called
  6. 14. force that tends to pull together the matter in stars
  7. 15. measure of the amount of light received on earth
  8. 16. huge group of single stars, star systems, star clusters
Down
  1. 2. Distance that light travels in one year
  2. 3. binary stars
  3. 4. Measure of the amount of light a star gives off
  4. 5. patterns of stars in the sky
  5. 8. active young galaxies with black holes at their centers
  6. 10. has bulge in middle and arms spiral outward
  7. 11. no regular shapes; generally bright, young stars
  8. 13. enormous explosion