Crossword Puzzle B24 PF

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Across
  1. 4. in the universe there are many of these
  2. 6. everything is in it (Planets, etc..)
  3. 7. a massive self-luminous celestial body of gas
  4. 9. the ground of the earth
  5. 11. the state or chance of being possible
Down
  1. 1. batter-powered electric lamp
  2. 2. the force thats attracts a body toward to the centre of a planet
  3. 3. a large round object in space that moves around a star
  4. 5. rain can fall out of it
  5. 8. a species from another planet
  6. 10. the aliens fly with it around