Oort clood

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The Oort clood /ˈɔːrt/[1] (named efter the Dutch astronomer Jan Oort), or Öpik–Oort clood,[2] is a hypothesized spherical clood o predominantly icy planetesimals that mey lie roughly 50,000 AU, or nearly a licht-year, frae the Sun.[3] This places the clood at nearly a quarter o the distance tae Proxima Centauri, the nearest starn tae the Sun.

References[eedit | eedit soorce]

  1. "Oort". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005.  (Subscription or UK public library membership required.)
  2. Whipple, F. L.; Turner, G.; McDonnell, J. A. M.; Wallis, M. K. (1987-09-30). "A Review of Cometary Sciences". Philosophical Transactions of the Royal Society A. Royal Society Publishing. 323 (1572): 339–347 [341]. Bibcode:1987RSPTA.323..339W. doi:10.1098/rsta.1987.0090.  Cite uses deprecated parameter |coauthors= (help)
  3. Alessandro Morbidelli (2006). "Origin and dynamical evolution of comets and their reservoirs of water ammonia and methane.". arXiv:astro-ph/0512256 [astro-ph].