Spiral arm

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Notion

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Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Spiral arm”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: The Hubble Heritage Team (AURA/STScI/NASA) NASA Headquarters - Greatest Images of NASA (NASA-HQ-GRIN), Public domain, via Wikimedia Commons.