The large, outer planets have high masses and hence generate powerful gravitational fields, and yet they have low average densities. What does this indicate about their interiors?
A) The interiors are hot and gaseous, like those of cool stars.
B) The interiors are composed mainly of water.
C) The interiors are composed mainly of very light elements, such as hydrogen and helium.
D) The interiors have not condensed to liquid or solid form.

Question

Quizplus · Accepted Answer

The low average densities of the large, outer planets suggest that their interiors are composed mainly of very light elements, such as hydrogen and helium, which contribute to their significant volume without adding much weight, compared to denser materials.

The Large, Outer Planets Have High Masses and Hence Generate