A ring system circling a young giant planet about 430 light years from Earth is 200 times the size of Saturn's rings, scientists have discovered. WSJ's Monika Auger reports. Photo: Ron Miller ...

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If Saturn's rings are older, they are also easier to explain. The Solar System was much more chaotic billions of years ago, ...

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THE band positions in the visible region of a porphyrin spectrum are influenced by the electrophilic nature of the substituents conjugated with the porphyrin ring system; the more electrophilic ...

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