A New Earth

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Across
  1. 2. a large round object of burning gas in space(e.g., the sun)
  2. 3. people who study the planets and stars in
  3. 6. large round objects in space made of rock and
Down
  1. 1. going around a planet or star
  2. 3. the gas humans breathe
  3. 4. or gas (e.g., the Earth)
  4. 5. the solid part of the Earth or a planet