The Oort Cloud
In January 13th 1950, in his paper ‘The Structure of the Cloud of Comets Surrounding the Solar System and a Hypothesis Concerning its Origin’, Jan Oort suggested that comets come from a common region outside our Solar System (now called the Oort cloud).
Source: Sagan, Carl. Cosmos. New York: Random House, 1980
Public Domain
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Full disclosure, I may occasionally borrow a sentence from Will Durant's Story of Civilization. I absolutely love that collection!