Why is the Oort cloud a 'cloud'?
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The Oort Cloud is believed to be a thick bubble of icy debris that surrounds our solar system. read more
Source: solarsystem.nasa.gov
The Oort cloud (/ ɔːr t, ʊər t /), named after the Dutch astronomer Jan Oort, sometimes called the Öpik–Oort cloud, is a theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from 50,000 and 200,000 AU (0.8 and 3.2 ly). read more
Source: en.wikipedia.org
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What is the Oort Cloud?
phys.org