Across
- 1. Large cluster of star, dust, gas and matter
- 3. Small, icy body with elongated orbit around the sun
- 7. Planets made of rocky material
Down
- 1. Planets made from gaseous elements
- 2. Includes all matter and space that exists
- 4. Rocky material passing through Earth's atmosphere
- 5. Rocky bodies often found in a belt
- 6. Formed about 5 billion years ago from rotating disk of dust