Wolf–Rayet star

Rarity: Rare

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

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What Wikipedia says

Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of ionised helium and highly ionised nitrogen or carbon.

Excerpt from the Wikipedia article “Wolf–Rayet star”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ESA/Hubble & NASA; Acknowledgement: Judy Schmidt (geckzilla.com), CC BY 4.0, via Wikimedia Commons.