Oort cloud The Oort cloud (/ˈɔːrt/ or /ˈʊərt/,[1] named after the Dutch astronomer Jan Oort), sometimes called the Öpik–Oort cloud,[2] is a theoretical cloud of predominantly icy planetesimals believed to surround the Sun to as far as somewhere between 50,000 and 200,000 AU (0.8 and 3.2 ly).[note […]
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