Accretion disk

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A topic known well beyond its field, found in many languages.

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What Wikipedia says

An accretion disk is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a massive central body. The central body is most frequently a star.

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

Image: NASA, Public domain, via Wikimedia Commons.