Galaxies

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