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
- __ cloud: remote solar system region
- ___ cloud: solar system region beyond Pluto
- Astronomer who proposed the existence of a cloud of frozen comet nuclei beyond the Kuiper Belt
- ___ cloud, source of some comets (anagram of 'root')
- 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
Possible answers
- O
- O
- R
- T