KnowraOort cloudLinked fromLinked fromThe 17 pages that link to Oort cloud, each with the reason it gives.All 17Broader topic 4Related 8Narrower topic 2Compared with 3Solar SystemBroader topic: Its existence is inferred chiefly from the paths of long-period comets, not direct observations.Galactic tideBroader topic: Galactic tides can change the orbits of its comets and send some toward the inner Solar System.Jan OortBroader topic: Oort proposed it as the source of long-period comets.Scattered discBroader topic: Further scattering can send scattered-disc objects toward the region associated with long-period comets.