- 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
- 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
- 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
- Types of Galaxies | Pictures, Facts, and Information
Although these are the four main types, there are various types of galaxies, and they are classified by shape A galaxy is a cluster of stars, gas, and dust that is kept together by the force of gravity Within galaxies, there are also planets, black holes, moons, comets, and dark matter
- 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? - 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
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