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NASA supercomputer finds billions of comets mimicking the Milky Way's shape: 'The universe seems to like spirals!' Spirals are a repeating theme in astronomy, with arguably the most famous example of a swirling armed structure being our home galaxy, Milky Way. Now, using a powerful NASA supercomputer called "Pleiades," scientists have discovered yet another spiral structure on edge of our solar system.
https://www.space.com/the-universe/solar...ke-spirals

Oort cloud spiral is composed of billions of icy bodies surrounded by a shell of comets. Even though Oort cloud lurks at edge of our own planetary system & about 99,000 times as wide as the distance between Earth & sun, scientists have thus far been in the dark about structure of Oort cloud. Findings, however, give researchers an important clue about the object.

"Found are some comets in the inner Oort cloud found between 1,000 au to 10,000 au, form a long-lasting spiral structure," Luke Dones, study team member & principal scientist at Southwest Research Institute, told Space.com. (The measurement "au" stands for "astronomical unit," one au is equal to the distance between Earth and sun.)