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...owards the [[Sun]] from the [https://en.wikipedia.org/wiki/Oort_Cloud Oort Cloud] because of [[gravitational]] perturbations caused by either the massive ou

...llapse of a giant [https://en.wikipedia.org/wiki/Molecular_cloud molecular cloud] approximately 4.6 billion years ago. Of the retinue of objects that [[orbi ...ered disc. The hypothetical [https://en.wikipedia.org/wiki/Oort_cloud Oort cloud], which acts as the [[source]] for long-period comets, may also exist at a

...ion. This [[uniformity]] of [[motion]] is due to the collapse of a [[gas]] cloud. The [[nature]] of the collapse is explained by the principle called [https [[Comets]] from the [https://en.wikipedia.org/wiki/Oort_cloud Oort cloud] are much more likely than asteroids to be retrograde. [https://en.wikipedi

...i]]. (The much more distant [https://en.wikipedia.org/wiki/Oort_cloud Oort cloud] is hypothesized to be the main reservoir of dormant [[comets]].) Other rec

...lanetary/ ] Beyond Neptune lie the [[Kuiper Belt]], and finally the [[Oort Cloud]], which may extend as far as a light-year. ...gions of dust and gas, known as giant molecular clouds. When destabilized, cloud fragments can collapse under the influence of gravity, to form a protostar.

...tides", which, according to mathematical models, increase the flux of Oort cloud comets into the Solar System by a factor of 4, leading to a massive increas # Michael Szpir. "Perturbing the Oort Cloud". American Scientist. The Scientific Research Society. Retrieved 2008-03-25