How is the theoretical structure of the Oort Cloud primarily described in contrast to the Kuiper Belt's shape?
Answer
A theoretical, spherical shell that envelops the entire solar system
The text explicitly contrasts the two main distant regions by their geometry. The Kuiper Belt is described as a flat, doughnut-shaped region. Conversely, the Oort Cloud is characterized as a theoretical, spherical shell that completely encircles the entire solar system, extending much farther out than the planar disk structure of the Kuiper Belt. This spherical distribution is a key factor in why its objects are spread out in all directions, creating significant observational challenges.
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