BIG BANG THEORY

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Across
  1. 4. keeps things from floating off the earth
  2. 9. a huge collection of gas, dust, and billions of stars and their solar systems.
  3. 11. Large marsupial
  4. 12. Man's best friend
  5. 13. chemicals
Down
  1. 1. growing
  2. 2. showing little or no change
  3. 3. Flying mammal
  4. 5. balloon growing as you blow it up
  5. 6. sparkles in sky at night
  6. 7. following a curved path around the earth
  7. 8. Has a trunk
  8. 10. Likes to chase mice