2the jovian moons probably have far more internal

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2.The jovian moons probably have far more internal heat generated by radioactive decay 3. Jovian moons are made mostly of ice that can melt or deform at lower temperatures than can the rock and metal that make up the Moon and Mercury. 3. Jovian moons are made mostly of ice that can melt or deform at lower temperatures than can the rock and metal that make up the Moon and Mercury.
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That is why icy worlds need far less internal heat for geological activity than rocky worlds. Why do astronomers believe that Triton is a captured moon? 1. Triton is very small and potato-shaped, which is common of captured moons. 2. Triton orbits Neptune in a direction opposite that of Neptune's rotation. 3. Triton is too large to have been formed in the "miniature solar nebula" thought to have surrounded Neptune in its very early history. 3. Triton is too large to have been formed in the "miniature solar nebula" thought to have surrounded Neptune in its very early history. This "backward" orbit is a tell-tale sign of a captured moon.
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