The result has the elegance of a formal dance - a kind of minuet, in which the participants advance and retreat according to well-understood rules, until they have arrived at a satisfactory outcome.

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Beneath his reassuring words, though, a complicated diplomatic minuet is clearly under way in northern Asia.

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Both planets are "fluffy, " gaseous, Saturn-size worlds, where temperatures quickly rise and fall from balmy to near boiling, as the planets periodically swing close to their stars and then spin away in an elliptical minuet, the researchers reported.

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