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Given that Pluto’s mass is 1.3 x 1022 kg and its radius is 1.1 x 106...

Given that Pluto’s mass is 1.3 x 1022 kg and its radius is 1.1 x 106 metres. What is its average density? Give your answer in kg/m3. Using these units, the density of water is 1000 kg/m3 and iron is about 7000 kg/m3. Do you think that Pluto has a large core of iron like the Earth?
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Answer #1

The volume of Pluto is

The density of Pluto is

Pluto has a thick icy layer whose density is the same as that of water, 1000 kg/m3. In order to have an average density of about 2000 kg/m3 Pluto must have a SMALL core of iron.

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