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In page Galaxy:

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The word galaxy was borrowed via French and Medieval Latin from the Greek term for the Milky Way, galaxías (kúklos) γαλαξίας (κύκλος)[1][2] 'milky (circle)', named after its appearance as a milky band of light in the sky.[3][4] In the astronomical literature, the capitalised word "Galaxy" is often used to refer to the Milky Way galaxy, to distinguish it from the other galaxies in the universe.[citation needed]