Oort cloud - Wikipedia, the free encyclopedia
The Oort cloud /ˈɔrt/[1] (named after Jan Oort), or Öpik–Oort cloud,[2] is ahypothesized spherical cloud of predominantly icy planetesimals that may lie roughly 50,000 AU, or nearly a light-year, from the Sun.[3] This places the cloud at nearly a quarter of the distance to Proxima Centauri, the nearest star to the Sun. TheKuiper belt and the scattered disc, the other two reservoirs of trans-Neptunian objects, are less than one thousandth of the Oort cloud's distance. The outer limit of the Oort cloud defines the cosmographical boundary of theSolar System and the region of the Sun's gravitational dominance.[4]
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