Question

Explain why the outer planets have a lower density than the inner planets.

Answer 1

The outer planets, other than Pluto, are gas giant planets - made up primarily of gases and liquids, with relatively small solid cores. The inner planets are made up of solids, with relatively small atmospheres. So, it stands to reason that the inner planets are denser than the outer planets.

Answer 2

The outer planets, other than Pluto, are gas giant planets - made up primarily of gases and liquids, with relatively small solid cores. The inner planets are made up of solids, with relatively small atmospheres. So, it stands to reason that the inner planets are denser than the outer planets.

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