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He hypothesised the existence of a cometary debris outside the known solar-system. This was confirmed in 1993.
He hypothesised the existence of a cometary debris outside the known solar-system. This was confirmed in 1993.
The existance of the [[Kuiper belt]] and the [[Oort Cloud]] is still an item of debate among astronomers.
The existence of the [[Kuiper belt]] and the [[Oort Cloud]] is still an item of debate among astronomers.