- 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
The existence of galaxies was not recognized until the early 20th century Since then, however, galaxies have become one of the focal points of astronomical investigation The notable developments and achievements in the study of galaxies are surveyed here
- 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
- Types of Galaxies and Their Evolution: How Galaxies Form and Change . . .
Explore types of galaxies, galaxy evolution, and galaxy formation from spirals to ellipticals, revealing how cosmic structures develop over billions of years
- 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
- What is a Galaxy? - sciencenewstoday. org
Galaxies are the grand islands of the universe, each one a vast metropolis of stars, gas, dust, dark matter, and endless possibility From tiny dwarfs to sprawling giants, galaxies tell the story of the cosmos—its birth, evolution, and perhaps its ultimate fate
- Galaxies | Latest Developments in Galaxy Formation and Evolution
Learn about galaxies near and far, from the earliest to form in the distant universe to stunning spirals in our neighborhood
- What Is a Galaxy? - Scientific American
Huge clouds of invisible dark matter accumulated regular matter (in the form of gas) via gravity, which eventually collapsed to form galaxies and the stars in them
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