| Answer | Crossword Clue |
|---|---|
| LEY | Willy ... of rocketry |
| LEY | Rocketry writer Willy |
| LEY | Rocketry pioneer Willy |
| LEY | Willy ..., rocketry expert |
| LEY | Willy ..., pioneering writer on rocketry |
| GODDARD | Father of modern rocketry |
| rocketries | ROCKETRY, the science of rockets |
