Galaxy - Wikipedia
WEBA 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
WEB3 days ago · 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. Nature has provided an immensely varied array of galaxies, ranging from faint, diffuse dwarf objects to brilliant spiral-shaped giants.
Galaxies - NASA Science
WEBGalaxies 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 …
What Is a Galaxy? | NASA Space Place – NASA Science for Kids
WEBSep 17, 2024 · A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. We live on a planet called Earth that is part of our solar system. But where is our solar system? It’s a small part of the Milky Way Galaxy.
Galaxies—facts and information - National Geographic
WEBApr 17, 2019 · 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’s a galaxy? All you need to know - EarthSky
WEBMay 21, 2024 · What is a galaxy? 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 - HubbleSite
WEBJan 31, 2024 · Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity. Hubble’s keen eye has revealed intricate details of the shapes, structures, and histories of galaxies — whether alone, as part of small groups, or within immense clusters.
Galaxies Images - NASA Science
WEBNASA’s James Webb Space Telescope has peered into the chaos of the Cartwheel Galaxy, revealing new details about star formation... This landscape of “mountains” and “valleys” speckled with glittering stars is actually the edge of a nearby, young, star-forming region...
Size, composition, and structure of galaxies | Britannica
WEBgalaxy, Any of the billions of systems of star s and interstellar matter that make up the universe. Galaxies vary considerably in size, composition, structure, and activity, but nearly all are arranged in groups, or clusters, containing from a few galaxies to as many as 10,000.
What is a galaxy? - Live Science
WEBAug 25, 2021 · Galaxies are groups of stars and other space objects held together by gravity. There are more than 100 billion galaxies in the universe, each presenting beautiful structures that can be seen in...
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