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SESK: Stuff Everyone Should Know · sesk.info/astro-oort-cloud-shape

How is the distant Oort Cloud thought to be shaped?

As a vast spherical shell around the solar system.

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  1. A thin ring inside Mercury
  2. A spiral arm of the galaxy
  3. A giant spherical shell ✔

Why: Unlike the roughly disk-shaped planetary system and Kuiper Belt, the Oort Cloud is modeled as a thick spherical swarm of distant icy bodies. It has never been directly observed.

Huh, didn't know that: Its outer edge may lie around 100,000 AU from the Sun, a big fraction of the way to the nearest stars.

The dad joke
The Oort Cloud goes all around the subject.
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References

Answer: A giant spherical shell. Unlike the roughly disk-shaped planetary system and Kuiper Belt, the Oort Cloud is modeled as a thick spherical swarm of distant icy bodies. It has never been directly observed.

  1. What's That Space Rock? science.nasa.gov/solar-system/10-things-whats-that-space-rock
    the Oort Cloud is believed to be a giant spherical shell surrounding the Sun, planets, and Kuiper Belt Objects.
    Checked 2026-10-10.

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