Across
- 2. no return
- 4. the amount of matter
- 7. Waves that vibrate in all directions
- 8. people who detect activity in space
- 11. an object so massive and dense
- 12. Powerful matter that moves fast like the speed of light
- 13. a force that attracts objects toward one another
Down
- 1. exerts force on moving charged particles
- 3. waves
- 5. break down
- 6. Whirls growing hot that has high speed
- 9. particles of light
- 10. Hot flowing matter made up of charged particles