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When Neptune got its stunning close-up: The Voyager 2 flyby, 30 years later | CNN
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How Far is Neptune from Earth? Facts About Neptune - AstroJunkies.com
The Orbit of Neptune. How Long is a Year on Neptune? - Universe Today
Nasa plots mission to explore Neptune's moon Triton – solar system's coldest object 'may have ocean harbouring alien life' | The Sun
Mission to Neptune - Get facts about this planet
