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Galaxy - Wikipedia
Galaxy | Definition, Formation, Types, Properties, & Facts
Galaxies - NASA Science
What Is a Galaxy? | NASA Space Place – NASA Science for Kids
Galaxies—facts and information - National Geographic
What’s a galaxy? All you need to know - EarthSky
Galaxies - HubbleSite
Galaxies Images - NASA Science
Size, composition, and structure of galaxies | Britannica
What is a galaxy? - Live Science