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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), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System
Galaxy | Definition, Formation, Types, Properties, Facts . . . 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 Galaxy Basics 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 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’s a galaxy? All you need to know - 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
Galaxy - Elliptical, Spiral, Irregular | Britannica In Hubble’s scheme, which is based on the optical appearance of galaxy images on photographic plates, galaxies are divided into three general classes: ellipticals, spirals, and irregulars Hubble subdivided these three classes into finer groups