Dutch astronomer who first postulated the existence of a cloud in the most distant region of the solar system where long-period comets are thought to originate
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Related clues
- Jan --, Dutch astronomer
- Jan ____, Dutch astronomer
- Astronomer who proposed the existence of a cloud of frozen comet nuclei beyond the Kuiper Belt
- ____ cloud, remote part of our solar system named after a Dutch astronomer
- Name of the giant theoretical cloud where long-period comets are believed to originate
Possible answers
- O
- O
- R
- T