astronomy

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Across
  1. 5. big and made of gas
  2. 7. spherical and mostly rocky and barren
  3. 8. collapsed dead star
  4. 9. dirty snowballs
  5. 11. earths companion
  6. 12. the only planet that can support life
Down
  1. 1. how it all began
  2. 2. you'd get no reception with out it
  3. 3. it would not end well in one hit earth
  4. 4. the study of space
  5. 6. the death on a star
  6. 10. infinite falling