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Neptune - Wikipedia
Neptune - NASA Science
Neptune Facts - Science@NASA
Neptune Facts - Interesting Facts about Planet Neptune
Neptune | Planet, Moons, Rings, Temperature, Mass, Diameter, & Facts
All About Neptune | NASA Space Place – NASA Science for Kids
In Depth | Neptune – NASA Solar System Exploration
Neptune Facts | Temperature, Surface, Information, History
Neptune facts and information - National Geographic
Neptune: Size, distance from the Sun, orbit | Astronomy.com