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