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