Solar system

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Across
  1. 3. the only plant that would float on water
  2. 5. Explodes in 2-3 billion years
  3. 7. our “space neighborhood”
Down
  1. 1. 100-200 billion universes in it
  2. 2. No moons or rings
  3. 4. planet with 28 moons
  4. 6. 13.6 billion years old