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Cetus (/ˈsiːtəs/ SEE-təss) is a constellation, sometimes called 'the whale' in English. The Cetus was a sea monster in Greek mythology which both Perseus and Heracles needed to slay. Cetus is in the region of the sky that contains other water-related constellations: Aquarius, Pisces and Eridanus.
Source: Wikipedia
Image source: IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg)
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