Oort Cloud
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The Oort Cloud is a spherical cloud of comets which lies roughly 50,000 AU, or nearly a light-year, from the central star

This places the Oort Cloud of the Sol System at nearly a quarter of the distance to Proxima Centauri, the nearest star to the Sun. The Kuiper belt and scattered disc, the other two known reservoirs of trans-Neptunian objects, are less than one thousandth the Oort cloud's distance. The outer extent of the Oort cloud defines the gravitational boundary of a planetary system.

During the Catian War, the Sol System's Oort Cloud was used by the Catians as a staging area for hit and run attacks in the system. By the 27th century, Sol's oort cloud has become populated by slavers and criminals. Space Force has been trying to police the area since the war, but its vast size makes it extremely difficult.

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