space

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Across
  1. 1. way our galaxy
  2. 3. where all the planets are
  3. 7. none of this exists in space
  4. 8. balls of hot gas
Down
  1. 1. red planet
  2. 2. earth's twin
  3. 4. not a planet
  4. 5. only planet that we know of to have water
  5. 6. hole a place in space where gravity pulls so much that even light can not get out
  6. 9. Earth's natural source of light