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Galaxy - Wikipedia
What Is a Galaxy? | NASA Space Place – NASA Science for Kids
Galaxies - NASA Science
Galaxy | Definition, Formation, Types, Properties, & Facts | Britannica
Milky Way - Wikipedia
Galaxies - HubbleSite
Galaxies—facts and information - National Geographic
What’s a galaxy? All you need to know - EarthSky
How Galaxies Work | HowStuffWorks
what is galaxy? all you need to know about it ... -