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A galaxy is a 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.

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.

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Galaxy | Definition, Formation, Types, Properties, & Facts | Britannica
www.britannica.com

What is a galaxy? A galaxy is 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. Galaxies usually exist in clusters, some of which measure hundreds of millions of light-years across.

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Galaxy
usegalaxy.org

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

Milky Way - Wikipedia
en.wikipedia.org

Because the galaxy is structured as a plane, a high density of stars is seen by looking into the plane, toward the Galactic Center. However, the other stars outside the band are also in the Milky Way. The galactic plane is 60 degrees tilted from the ecliptic of the Earth's orbit of the Sun.

Milky Way Galaxy | Size, Definition, & Facts | Britannica
www.britannica.com

Milky Way Galaxy (sometimes simply called the Galaxy), large spiral system of about several hundred billion stars, one of which is the Sun. It takes its name from the Milky Way, the irregular luminous band of stars and gas clouds that stretches across the sky as seen from Earth.

Galaxies | Astronomy.com
www.astronomy.com

Our home galaxy hosts hundreds of billions of stars orbited by countless worlds. Located 12 million light-years away, M82 appears high in the northern spring sky in the direction of the...