Astronomy 2.20

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Across
  1. 3. ours has 8 planets
  2. 6. a large cloud of gas & dust, such as the one that formed our solar system
  3. 8. smallest unit of the Universe
  4. 9. literally means "everything"
  5. 10. the theory that the Universe formed in a giant dramatic event
Down
  1. 1. the asteroid-like bodies that formed the building blocks of planets
  2. 2. a collection of billions to millions of stars
  3. 4. what planets revolve around
  4. 5. matter that does not interact with baryonic matter, itself, or light
  5. 7. a force causing the expansion of the Universe to accelerate