Galaxy Crossword

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Across
  1. 4. Poor metal
  2. 9. a bright blue Galaxy which in many new stars are forming
  3. 11. a flattened cloud of billions of stars
  4. 12. the effect of the focusing of light from a distant Galaxy
  5. 13. Small powerful source of energy through to be the active sore of a very distant Galaxy
  6. 15. The Galaxy we live in
Down
  1. 1. normal spiral Galaxy which an unusually brightness
  2. 2. object known brightness that astronomers use to find the distance
  3. 3. objects used to map spiral arms
  4. 5. Rich metal
  5. 6. The type of Galaxy we are
  6. 7. The combined calibrated of distance indicators used by astronomers to find the distance to remote galaxies
  7. 8. Nonluminous material that is detected only by its gravitational influence
  8. 10. Galaxy that is a source of excess radiation
  9. 14. the procedure for finding the mass of Galaxy from its rotation curve