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How big is Neptune?

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Neptune has an equatorial diameter of about 30,700 mi (49,400 km), nearly four times that of the earth, and a mass about 17 times the earth's mass.

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Get more facts and information about Neptune (astronomy) . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

Similar questions: What is Neptune's mass? What is the diameter of Neptune? What is Neptune's weight? What is Neptune's size? [ Hide these questions ]

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