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• n  (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun

• Oort cloud

News & Articles

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• Comets Could Arise Closer To Earth, Study Suggests
  There’s a potential “cometary graveyard” of inactive comets in our solar system wandering between Mars and Jupiter, a new Colombian research paper says. This contradicts a long-standing view that comets originate on the fringes of the solar system, in the Oort Cloud. (...)Read the rest of Comets Could Arise Closer To Earth, Study Suggests (349 [...]
  Aug. 2, 2013 - Universe Today