Astronomer who proposed the existence of an immense cloud of icy comets and matter leftover from the solar system's formation some 4.5 billion years ago
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Related clues
- 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
- ____ cloud, remote solar system region
- Dutch astronomer Jan —
- Astronomer who proposed what is now the generally accepted model for the origin of comets
- Name of the giant theoretical cloud where long-period comets are believed to originate
Possible answers
- O
- O
- R
- T