Planets crossword puzzle

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Across
  1. 4. Celestrial object
  2. 6. Surrounds planets with gas
  3. 7. Only planet with life on it
  4. 8. Planets Planets that are Earth like
Down
  1. 1. Similar to Earth
  2. 2. planets Planets that are in the asteroid belt
  3. 3. Used to be a planet but is now a dwarf planet
  4. 4. Closest planet to the sun
  5. 5. Known as the "Red Planet"
  6. 9. gravity Helps keep the planets to orbit