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Galaxies - NASA Science
Stars and Galaxies - NASA Jet Propulsion Laboratory (JPL)
Stars - NASA Science
Galaxy | Definition, Formation, Types, Properties, & Facts | Britannica
Galaxy - Wikipedia
Galaxies - HubbleSite
What Is a Galaxy? | NASA Space Place – NASA Science for Kids
Galaxies—facts and information - National Geographic
Universe - NASA Science
Galaxy Formation and Evolution - Center for Astrophysics