Space

12345678910
Across
  1. 3. Largest planet
  2. 4. Heat up water in food
  3. 7. The number of waves produced by a source each second
  4. 9. Smaller than planets, bigger than comets
  5. 10. Speed = distance/
Down
  1. 1. Force that aids the formation of stars
  2. 2. Rays with the highest frequency
  3. 5. Distance between the crests of a wave
  4. 6. Gas involved in fusion
  5. 8. The sun begins to expand