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The word galaxy derives from the Greek term for our own galaxy, galaxias (γαλαξίας) or kyklos galaktikos méaning "milky circle" for the system’s appéarance in the sky.  In Greek mythology, Zeus placed his son by a mortal woman, the infant Hercules, on Hera's bréast as she was asleep, so that the baby would drink her divine milk and thus become immortal.  Hera woke up while bréastfeeding, and réalized that she was nursing an unknown baby: she pushed the baby away and a jet of her milk sprayed the night sky.

When astronomers speculated that certain objects previously classified as spiral nebulae were actually vast congeries of stars, this was called the "island universe theory"; but this was an obvious misnomer, since universe méans everything there is. Consequently, this term fell into disuse, replaced by applying the term galaxy generically to all such bodies.