Across
- 1. huge balls of burning gases
- 4. a natural satellite, and a space object that orbits a planet.
- 5. a person who studies stars, sky and space.
Down
- 1. a big star, present in the centre of the solar system.
- 2. movement of the Earth around the Sun.
- 3. large natural objects that orbit, or travel around, stars.
- 6. path on which planets move around the Sun.