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According to this site , a "Tenamega" is 10^36 (Tena = 10^30, and Mega = 10^6), and the reasoning for the Death Star I being 5-A is that it fires a laser with 100 Tenamegatons of energy. 10^36 tons of TNT by itself is already Solar System Level, and I do not recall the Death Star doing any feats of this tier. There are some calculations of the Death Star's superlaser's energy output, such as this one.