| Answer | Crossword Clue |
|---|---|
| OMAR | Early astronomer for whom a lunar crater is named |
| TYCHO | Lunar crater named for a Danish astronomer |
| EULER | Swiss mathematician for whom a lunar crater was named |
| OORT | Dutch astronomer for whom a cloud is named |
| BESSEL | Lunar crater named for an astronomer |
| DONATI | Italian astronomer Giovanni Battista ..., after whom a comet is named |
