Question

what if we exploded over 10 billion Hiroshima bombs at once??​

Answer 1

The detonation happened at an altitude of 1,968 ± 50 feet (600 ± 15 m). It was less powerful than the Fat Man, which was dropped on Nagasaki, but the damage and the number of victims at Hiroshima were much higher, as Hiroshima was on flat terrain, while the hypocenter of Nagasaki lay in a small valley.

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Answer 2

Answer:

if we exploded over 10 billion Hiroshima bombs at once the energy released by their simultaneous detonation wouldn't destroy the Earth. It would, however, make a crater around 10km across and 2km deep. The huge volume of debris injected into the atmosphere would have far more widespread effects.