Across
- 1. Solid materials with a natural, repeating structure.
- 3. A strong force pushing on something.
- 6. Extremely hot.
- 7. The path a planet travels around a star.
- 8. A chemical element that can form diamonds.
- 9. The distance light travels in one year.
Down
- 2. How hot or cold the outside of a planet is.
- 4. A scientist who studies outer space.
- 5. Meaning