Across
- 3. the hottest planet in the solar system
- 6. region located between Mars and Jupiter
- 7. the star at the centre of the solar system
- 8. the closest planet to the sun
Down
- 1. the earliest stage of a star's formation
- 2. model where the sun is at the centre of the solar system
- 4. spins on its side like a rolling ball
- 5. was considered the ninth planet in the solar system until 2006