A New Earth

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