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SESK: Stuff Everyone Should Know · sesk.info/astro-kuiper-belt-region

Where does the Kuiper Belt's main region begin?

Near Neptune's orbit at about 30 AU.

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  1. Near Mars at 1.5 AU
  2. Near Neptune at 30 AU ✔
  3. Near the Oort Cloud at 5,000 AU

Why: The Kuiper Belt is a thick, disk-like region of icy bodies beyond Neptune. Its main region extends roughly from 30 to 50 AU from the Sun.

Huh, didn't know that: Pluto, Haumea, and Makemake are Kuiper Belt dwarf planets.

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The Kuiper Belt is beyond Neptune, where leftovers keep their cool.
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References

Answer: Near Neptune at 30 AU. The Kuiper Belt is a thick, disk-like region of icy bodies beyond Neptune. Its main region extends roughly from 30 to 50 AU from the Sun.

  1. Kuiper Belt Facts science.nasa.gov/solar-system/kuiper-belt/facts
    Its inner edge begins at the orbit of Neptune, at about 30 AU from the Sun.
    Checked 2026-10-10.

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