Dutch astronomer Jan —
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Related clues
- Name of the giant theoretical cloud where long-period comets are believed to originate
- Jan —; Dutch astronomer who proposed the existence of a theorised shell of icy objects existing beyond the Kuiper Belt
- Dutch astronomer Jan who postulated an eponymous 'cloud' of comets
- ___ cloud: solar system region beyond Pluto
- ___ cloud (cosmic debris)
Possible answers
- O
- O
- R
- T