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  1. Galaxy | Definition, Formation, Types, Properties, & Facts | Britannica

    4 days ago · 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. …

  2. Galaxy - Wikipedia

    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), literally …

  3. Galaxies - NASA Science

    May 2, 2025 · 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 …

  4. Fact sheet: Galaxy - Canadian Space Agency

    Galaxies are filled with different objects that vary in temperature. They are mostly empty space, though, so the average temperature of any given spot in a galaxy is likely to be quite cold. …

  5. Galaxies—facts and information | National Geographic

    Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity. Nearly all large galaxies are thought to also...

  6. Galaxy - ESA/Hubble

    Galaxy A galaxy is a ensemble of stars, dust, gas and dark matter that are bound together by gravity. Galaxies contain anywhere between a few hundred million to a hundred trillion stars. …

  7. 26 Facts About Galaxy

    Jan 19, 2025 · Discover 26 mind-blowing facts about galaxies, from their formation to their mysterious dark matter, and expand your cosmic knowledge!

  8. 40 Amazing Facts About Galaxy | Amazing Facts 4U

    Jun 26, 2025 · 40 Amazing Mind-Boggling Facts About Galaxy - 1.) A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium …

  9. 34 Mind-Blowing and Fun Galaxy Facts | FactRetriever.com

    Jan 4, 2022 · Galaxies are awesome in scope, and fill the mind with imagination and wonder. Explore the furthest reaches of space with us in our list of fun galaxy facts.

  10. Galaxy Facts - Interesting Facts about Galaxies

    A galaxy is a massive, gravitationally bound system that consists of stars, stellar objects (such as brown dwarfs and neutron stars), nebulae, an interstellar medium of gas and dust, black holes, …