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  1. 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 …

  2. 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 …

  3. Galaxia | Pioneering Space Intelligence for a Smarter Earth | GALAXIA

    Galaxia is at the forefront of Atlantic Canada’s space technology industry, delivering real-time data, AI-driven insights, and advanced mission solutions for sectors such as energy, defense, …

  4. 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...

  5. How galaxies form: Theories, variants and growth | Space

    Jul 13, 2022 · Here are some of the most promising theories of how galaxies form, how and why they merge, as well as the different varieties of galaxies that have been observed. As the …

  6. What is a galaxy? - Live Science

    Aug 25, 2021 · Galaxies are groups of stars and other space objects held together by gravity. There are more than 100 billion galaxies in the universe, each presenting beautiful structures …

  7. Types - NASA Science

    Oct 22, 2024 · Our Milky Way is one example of a broad class of galaxies defined by the presence of spiral arms. These galaxies resemble giant rotating pinwheels with a pancake-like …

  8. Galaxies: Collisions, Types and How They're Made | Space

    Jan 4, 2019 · Galaxies are composed of stars, dust and dark matter, all held together by gravity. Astronomers aren't certain exactly how galaxies formed. After the Big Bang, space was made …

  9. Galaxy - ESA/Hubble

    Galaxies are collections of stars, dust, gas, and dark matter, which are bound together by the gravitational attraction that results from their own mass. A small dwarf galaxy contains a few …

  10. Galaxia - Wikipedia

    Galaxia (plant), a genus in the iris family "Galaxia", a 1996 trance song by Ferry Corsten Sailor Galaxia, an antagonist from the original Sailor Moon anime series Galaxia, the sword Meta …