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definition of the word galaxy

by the Wiktionnary

The spiral galaxy NGC 1672
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From Greek γαλαξίας, meaning "milky"; named for the Milky Way, which seen in the night sky from the Earth's viewpoint forms a "milky way" or "road of milk", as the spiral arm of the galaxy forms a streak we can faintly see.

galaxy (plural: galaxies)

  1. a collection of billions of stars, galactic dust, black holes, etc. of which there are billions in the known universe. They usually form spiral or elliptical shapes likely due to a central gravity well (i.e. supermassive black hole), but some form irregular shapes (especially if they are broken away from another galaxy).
  2. our Milky Way galaxy
  3. name of the Lockheed C-5 aircraft, flown by the US Air Force.

Definition from Wiktionary
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