Why do astronomers believe that the Jovian planets are composed mainly of hydrogen and helium?
A) Because hydrogen and helium are the main constituents of the Solar System.
B) Because the Jovian planets are very large.
C) Because the Jovian planets have low densities.
D) The Voyager missions measured the chemical compositions of the interiors of the Jovian planets.

Question

Quizplus · Accepted Answer

The Jovian planets have low densities, which suggests that they are composed mainly of light elements such as hydrogen and helium.

Why Do Astronomers Believe That the Jovian Planets Are Composed