Parsec

Rarity: Rare

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

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

The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,265 astronomical units (au), i.e., 30.9 trillion kilometres (19.2 trillion miles).

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

Image: jd, Public domain, via Wikimedia Commons.