Across
- 3. Largest planet
- 4. Heat up water in food
- 7. The number of waves produced by a source each second
- 9. Smaller than planets, bigger than comets
- 10. Speed = distance/
Down
- 1. Force that aids the formation of stars
- 2. Rays with the highest frequency
- 5. Distance between the crests of a wave
- 6. Gas involved in fusion
- 8. The sun begins to expand