Comment Re:9 Megatons (Score 1) 299
For the record, it's also only the most powerful in current inventory. The Castle bravo device was detonated with an estimated yield of 15 Megaton.
The most powerful in the world is also still Tsar Bomba (50 megaton dialed down. Design yield was 100 megaton plus, but was not tested due to concerns of fallout).
Sources:
http://en.wikipedia.org/wiki/Castle_Bravo
http://en.wikipedia.org/wiki/Tsar_Bomba