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How far from the Sun does the main concentration of the Kuiper belt extend?
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Kuiper belt
An artist's rendition of a binary object in the Kuiper belt. The two objects depicted orbit each other at the edge of the solar system.
The main concentration of the Kuiper belt extends from 30 to 50 astronomical units (AU) from the Sun.1
While the inner boundary begins beyond the orbit of Neptune (approximately 30 AU), the outer edge is more poorly defined. Nominally, the belt excludes objects that never approach closer to the Sun than 47.2 AU, which marks the location of the 2:1 Neptune resonance.2