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
- Jan Hendrik ___, Dutch astronomer who gave his name to a cloud of comets
- Jan Hendrik ___, Dutch astronomer who proved that the Milky Way rotates and calculated the distance of the sun from the centre of the galaxy
- Astronomy's ___ cloud
- Frozen comet nuclei orbiting the solar system; _ cloud
- __ cloud: remote solar system region
Possible answers
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