13point8 · The universe, sourcedAll discoveries
Region · ~2,000–100,000 AU

Oort Cloud

Inner edge~2,000 AU?
Outer~100,000 AU?
StatusTheorised

A theorised spherical reservoir of comets, never observed directly.

WISE ruled out a Saturn-mass object to ~10,000 AU and a Jupiter-mass object to ~26,000 AU, excluding "Nemesis" and "Tyche" (Luhman 2014).

Sources

  1. Luhman 2014, ApJ 781:4 (WISE)
  2. Whitmire & Jackson 1984, Nature 308:713
  3. Davis, Hut & Muller 1984, Nature 308:715
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