Across
- 1. Half of the Earth (Northern, Southern, Eastern, Western)
- 6. A large group of stars held together by gravitation and separated from other groups of stars by large regions of space
- 7. The turning of an object on its axis; on complete rotation on an axis causes day and night
- 8. A ball of gas in space that produces its own heat and light
Down
- 2. A natural satellite that orbits a planet; some plants have no moons; others have over 60 moons
- 3. A system of planets and other bodies that orbit a star
- 4. The planet on which all known life exists
- 5. A large body in space that orbits a star and does not produce its own light