Hydra

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

Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees, and also the longest at over 100 degrees. Its southern end borders Libra and Centaurus and its northern end borders Cancer. It was included among the 48 constellations listed by the 2nd century astronomer Ptolemy.

Excerpt from the Wikipedia article “Hydra (constellation)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Till Credner, CC BY-SA 3.0, via Wikimedia Commons.