Subdivisions of Trans-Neptunian Space
Known trans-Neptunian objects are often divided into two subpopulations: the Kuiper belt and the scattered disc. A third reservoir of trans-Neptunian objects, the Oort cloud, is believed to exist, although no confirmed direct observations of the Oort cloud have been made. Some researchers further suggest a transitional space between the scattered disc and the inner Oort cloud, populated with "detached objects".
Read more about this topic: Scattered Disc
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“Though seas and land be ‘twixt us both,
Our faith and troth,
Like separated souls,
All time and space controls:
Above the highest sphere we meet
Unseen, unknown, and greet as angels greet.”
—Richard Lovelace (1618–1658)