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A galaxy is a physical system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. [1][2] The word is derived from the Greek galaxias (γαλαξίας), meaning 'milky', a reference to the Milky Way galaxy that contains the Solar System.

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Galaxies - NASA Science
science.nasa.gov

Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity. The largest contain trillions of stars and can be more than a million light-years across. The smallest can contain a few thousand stars and span just a few hundred light-years.

Galaxy
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Galaxy is a community-driven web-based analysis platform for life science research.

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Galaxy | Definition, Formation, Types, Properties, & Facts | Britannica
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Galaxy, any of the systems of stars and interstellar matter that make up the universe. Many such assemblages are so enormous that they contain hundreds of billions of stars.

What Is a Galaxy? | NASA Space Place – NASA Science for Kids
spaceplace.nasa.gov

What Is a Galaxy? The Short Answer: A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. We live on a planet called Earth that is part of our solar system. But where is our solar system? It’s a small part of the Milky Way Galaxy.

Milky Way - Wikipedia
en.wikipedia.org

Some authors use the term Milky Way to refer exclusively to the band of light that the galaxy forms in the night sky, while the galaxy receives the full name Milky Way Galaxy.

Galaxy - Simple English Wikipedia, the free encyclopedia
simple.wikipedia.org

Everything in a galaxy moves around a centre of mass, which is also an effect of gravity. There are various types of galaxies: elliptical, spiral and lenticular galaxies, which can all be with or without bars.