What observation leads to the conclusion that the two outer Galilean satellites of Jupiter are composed of roughly equal parts of rock and water ice?
A) Their densities are very low compared to other objects of comparable size such as the Moon or Mercury.
B) Their highly variable and localized magnetic fields closely resemble that of a mixture of iron rocks and water ice.
C) Their rotations show variations that are thought to be due to changes in shape; this could only happen if they were composed of a loose mixture of rocks embedded in the flexible ice.
D) Images of their surfaces show equal parts of rock and ice.
Correct Answer:
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