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
- Frozen comet nuclei orbiting the solar system; _ cloud
- Dutch scientist with an eponymous 'cloud'
- Dutch astronomer Jan who postulated an eponymous '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
- Dutch astronomer who lent his name to a cloud
Possible answers
- O
- O
- R
- T