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would an observing planet ~200 light years away notice if…

would an observing planet ~200 light years away notice if we had a nuclear war?

Say this planet knew earth existed and could accurately detect molecules in our atmosphere on it, and they may or may not have detected our radio signals. If, say, 30 nuclear bombs were dropped equidistantly across the earths surface, would they be able to see a difference in the planet? And what difference would they see?
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