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Unsolved
Puzzles
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Jupiter,
Saturn, Uranus, Neptune,
Pluto
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Why
is Uranus tilted so much?
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Why
are there more heavy elements in Uranus and Neptune
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What
causes their misaligned magnetic fields?
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What
is Neptune's heat source?
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One
possible cause for all of these:
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Uranus
and Neptune formed closer to the sun and were thrown out by large impacts
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