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Galaxy - Wikipedia
Galaxies - NASA Science
What Is a Galaxy? | NASA Space Place – NASA Science for Kids
Galaxy | Definition, Formation, Types, Properties, & Facts
Milky Way Galaxy | Size, Definition, & Facts | Britannica
Size, composition, and structure of galaxies | Britannica
NASA’s Webb Peers into the Extreme Outer Galaxy
The Milky Way: Understanding Our Place in the Galaxy
Galaxies - HubbleSite
What’s a galaxy? All you need to know - EarthSky