| Answer | Crossword Clue |
|---|---|
| REMOTECONTROL | Important use of radio waves. |
| RADIOFREEEUROPE | Important voice on the air waves. |
| PULSAR | Source of radio waves |
| QUASAR | Celestial source of radio waves |
| PULSAR | Celestial source of radio waves |
| PULSAR | Distant source of radio waves |
