Space!!!

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Across
  1. 1. astronomers theorize that at this single moment the universe was formed
  2. 4. there are three basic kinds of star clusters: open clusters, ________, and globular clusters
  3. 6. this cannot be directly seen
  4. 7. formed when a contracting cloud of gas and dust becomes so dense and hot that nuclear fusion begins
  5. 8. this shows that the universe is expanding
  6. 10. an explosion so violent that the dying star becomes more brilliant than an entire galaxy
  7. 11. enormously bright centers of distant, young galaxies
Down
  1. 1. it has gravity so strong that anything falling into it is trapped
  2. 2. a large cloud of gas and dust spread out over a large volume of space
  3. 3. this galaxy has a bar through the center with the arms extending outward from the bar on either side
  4. 5. an area of gas that is cooler than the surrounding gases
  5. 9. the sun stays stable because the inward pull of ______ balances the outward push of thermal pressure from nuclear fusion