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___ cloud (source of comets) Crossword Clue

4 letters · New York Times · Wednesday, May 18, 2016 · 36-Down

Appeared in 2 New York Times Crosswords between August 2014 and May 2016.

Exact puzzle match · New York Times · May 18, 2016 · 36-Down · 4 letters

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Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)

noun · fill-in-the-blank

WordNet® (Princeton University)

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