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  • 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), meaning 'milky', a reference to the Milky Way galaxy that contains the Solar System
  • Galaxy | Definition, Formation, Types, Properties, Facts | Britannica
    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
  • Galaxies - NASA Science
    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
  • What’s a galaxy? All you need to know about galaxies - EarthSky
    A galaxy can contain hundreds of billions of stars and be many thousands of light-years across Our own galaxy, the Milky Way, is around 100,000 light-years in diameter
  • What is a galaxy? - BBC Sky at Night Magazine
    A galaxy is a concentration of millions or billions of stars, gas clouds and pockets of dust, all bound by gravity and swathed in a cocoon of mysterious dark matter
  • What is a Galaxy? - sciencenewstoday. org
    A galaxy is one of the largest structures in the universe It is a gravitationally bound system made up of stars, planets, gas, dust, dark matter, and often mysterious phenomena such as black holes and energetic cosmic radiation
  • What Is a Galaxy? - Scientific American
    Very generally speaking, galaxies are tens of thousands to hundreds of thousands of light-years across and have millions to several trillions of stars Our Milky Way, for example, is about
  • 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 contain
  • Galaxy Types - NASA Science
    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 disk of stars and a central bulge or tight concentration of stars
  • Galaxy - Elliptical, Spiral, Irregular | Britannica
    Learn about the three general types of galaxies: spiral, elliptical, and irregular Almost all current systems of galaxy classification are outgrowths of the initial scheme proposed by the American astronomer Edwin Hubble in 1926





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