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- Galaxy | Definition, Formation, Types, Properties, Facts | Britannica
galaxy, 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 - 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 - EarthSky
A galaxy is a vast island of gas, dust and stars in an ocean of space Typically, galaxies are millions of light-years apart Galaxies are the building blocks of our universe
- 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
- What Are Galaxies? (With Understandable Details) - Owlcation
A galaxy is an astronomical unit composed of a cluster of stars, planets, and, in most or possibly all cases, a supermassive black hole Indeed, other material also makes up the galaxy, including anything clustered about and gravitationally bound to a supermassive black hole This includes gas clouds and even 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
- 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 These components are woven together by gravity, forming complex and beautiful structures that can span tens of thousands to hundreds of thousands of light-years
- Galaxy Facts - Interesting Facts about Galaxies - Space Facts
A galaxy is a massive, gravitationally bound system that consists of stars, stellar objects (such as brown dwarfs and neutron stars), nebulae, an interstellar medium of gas and dust, black holes, and an unknown component of dark matter Examples of galaxies range from dwarfs with as few as ten million stars to giants with a hundred trillion
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