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
- Astronomy's ___ cloud
- 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
- Jan –, Dutch astronomer who confirmed the theory of galactic rotation
- ___ cloud (source of comets)
- Astronomer who proposed what is now the generally accepted model for the origin of comets
Possible answers
- O
- O
- R
- T