Kuiper belt
WordNet
noun
(1) A disk-shaped region of minor planets outside the orbit of Neptune
WiktionaryText
Etymology
Named after the astronomer Gerard Kuiper (1905-1973); and belt.
Noun
- A region of space between 30 and 50 Astronomical Units from the sun, roughly confined within a thick band around the ecliptic. This area is populated by many thousands of trans-Neptunian objects.