Planet Neptune
Dwarf Planet Pluto

What is Neptune's mass?


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Neptune has a mass of 1.0243×1026 kilograms, or about 17.147 times that of Earth. Wikipedia has additional information, and a link is provided below to their post on this, the new "last planet" now that Pluto has been "demoted" to a planetary body. Neptune's density is 1.638 g/cm³. That means that in every cm cubed it weighs 1.638 grams.