Galaxies

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Across
  1. 3. what jets from super-massive black holes are made of
  2. 4. the force contributing to the expansion of the universe
  3. 8. is thought to make up 80% of the universe
  4. 11. this kind of galaxy contains some of the oldest stars
  5. 14. the super-cluster that the earth resides in
  6. 15. the shape of the milky way galaxy
  7. 16. cluster of galaxies
  8. 18. closest radio galaxy to the earth
  9. 19. brightest known objects in the universe
Down
  1. 1. a small galaxy contains less than one ______ stars
  2. 2. the force that causes galaxies to form systems with one another
  3. 5. what EROS's stand for
  4. 6. a massive group of stars
  5. 7. when galaxies pass one another, their clouds ______
  6. 9. forms a bridge between two super-clusters
  7. 10. this supercluster is 650 million light years across
  8. 12. this kind of galaxy does not have a definable shape
  9. 13. vast spaces found between filaments in the cosmos
  10. 17. seyfert galaxies show strong ______ emission