| Answer | Crossword Clue |
|---|---|
| KEPLER | Famous German astronomer. |
| HANSEN | Famous German astronomer. |
| KEPLER | German astronomer |
| KEPLER | German astronomer Johannes |
| GAUSS | Renowned 19th-century German mathematician and astronomer |
| BESSEL | German astronomer who was the first to measure the distance to a star |
