The answer is; Near the magnetic poles of Saturn
Auroras that are solar-generated occur when charged particles from the sun interact with the magnetosphere. The charged particles then interact iht the molecules in the atmospheres as they run through the planet’s magnetic field. Saturn's auroras are hydrogen based and can't be viewed in the visible light spectrum. Saturn also has other patched of auroras other than in its poles and these are not solar generated.
Pt-200 is most likely to undergo beta-minus decay. Two four given isotopes of platinum are radioactive. Pt-192 is a stable isotope.
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