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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 | 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
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 million stars, whilst the biggest known galaxies can contain up to a hundred trillion stars
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
Galaxies | Latest Developments in Galaxy Formation and Evolution With more than 100 billion galaxies in the observable universe, the exciting discoveries and unanswered questions are endless Each one is unique, from ellipticals that have quenched their star formation to the vast and breathtakingly beautiful spiral galaxies imaged in so many galaxy pictures
What is a Galaxy? - sciencenewstoday. org The Basics: What Is a Galaxy, Really? At its core, a galaxy is a massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter
Galaxy - Simple English Wikipedia, the free encyclopedia A galaxy is a group of many stars, with gas, dust, and dark matter [1][2][3][4] The name 'galaxy' is taken from the Greek word galaxia meaning milky, a reference to our own galaxy, the Milky Way NGC 2775 galaxy in the constellation of Cancer Gravity holds galaxies together against the general expansion of the universe [3] In effect, the expansion of the universe takes place between groups
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? - 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