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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
Galaxies - HubbleSite
What’s a galaxy? All you need to know - EarthSky
Galaxies Images - NASA Science
New 3D Visualization Highlights 5,000 Galaxies Revealed by ...
What is a galaxy? - Live Science