BL Lacertae object

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

A BL Lacertae object or BL Lac object is a type of active galactic nucleus (AGN) or a galaxy with such an AGN, named after its prototype, BL Lacertae. In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and large-amplitude flux variability and significant optical polarization.

Excerpt from the Wikipedia article “BL Lacertae object”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Renato Falomo, Public domain, via Wikimedia Commons.