Across
- 2. one of the four innner planets
- 3. Way a galaxy with one sun and eight planets
- 5. the tilt of the Earth on its axis causes these
- 6. smallest of the four inner planets
- 7. the largest planet in our solar system
- 8. what the four outer planets are mostly made of
Down
- 1. force that makes planets round
- 3. rocky object that orbits the Earth
- 4. small, rocky, icy, metallic bodies
- 9. the star at the center of our galaxy