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They number 4 in line, Jupiter, number 5, is the 1st of the Outer Planets and Gas Giants.

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The inner planets are Mercury, Venus, Earth, and Mars; the outer planets are further away than these.

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Being close enough to the Sun that solar radiation has largely stripped it of volatiles. The outer planets have retained most of their volatiles because they are further away from the Sun.

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7y ago

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