- Sultan, Washington (Wikipedia)
Sultan is a city in Snohomish County, Washington, United States. It is located approximately 23 miles (37 km) east of Everett at the confluence of the Skykomish River and the Sultan River, a minor tributary. The city had a population of 5,146 at the 2020 census.
- Spiral arm (Wikipedia)
Spiral arms are a defining feature of spiral galaxies. They manifest as spiral-shaped regions of enhanced brightness within the galactic disc. Typically, spiral galaxies exhibit two or more spiral arms. The collective configuration of these arms is referred to as the spiral pattern or spiral structure of the galaxy.