Galaxy
Galaxy
Galaxy (/ˈɡæl.ək.si/), from the Greek galaxias (γαλαξίας), meaning "milky", is a large system of stars, gas, dust, and dark matter bound together by gravity. The term was first used in this context by the English astronomer Sir John Herschel in the mid-19th century.
Etymology
The word galaxy is derived from the Greek galaxias, literally "milky", a reference to the Milky Way. The Greek word is a derivative of gala, which means "milk". In classical times, the Milky Way was thought to be a collection of diffused stars that formed a band of light in the night sky, which was likened to a river of milk.
Related Terms
- Star: A luminous sphere of plasma held together by its own gravity.
- Gravity: A natural phenomenon by which all things with mass or energy are brought toward one another.
- Milky Way: The galaxy that contains our Solar System.
- Dark Matter: A form of matter thought to account for approximately 85% of the matter in the universe.
- Astronomer: A scientist in the field of astronomy who studies stars, planets, and other celestial objects.
See Also
- List of galaxies
- Galaxy formation and evolution
- Galaxy cluster
- Galaxy groups and clusters
- Galaxy morphological classification
- Galaxy rotation curve
External links
- Medical encyclopedia article on Galaxy
- Wikipedia's article - Galaxy
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