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  • $\begingroup$ It looks like the actual exchange itself would not be visible. Nine orders of magnitude greater than the total global nuclear arsenal means extraordinarily good luck or sensitive equipment to detect the detonation of weapons at all. Far less likely for any single detonation given that all that energy would not be released at once. I figured the aftereffects could be detected, provided the planet had a transit that allowed the spectrographic analysis of the atmosphere. $\endgroup$ Commented Nov 2, 2016 at 13:43