Dutch astronomer Jan who postulated an eponymous 'cloud' of comets
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Related clues
- Jan –, Dutch astronomer who confirmed the theory of galactic rotation
- Jan —; Dutch astronomer who proposed the existence of a theorised shell of icy objects existing beyond the Kuiper Belt
- Jan --, Dutch astronomer
- Astronomer who proposed what is now the generally accepted model for the origin of comets
- Dutch astronomer with an eponymous ice cloud
Possible answers
- O
- O
- R
- T