If the Tsar Bomba, a 50 megaton nuclear bomb, exploded in the universe, many satellites would be burnt and the United States would lose power for days.
The secret letter revealed that the first British satellite cause of Ariel-1 was broken after an American nuclear test.
ElectroMagnetic Pulse (EMP) is a weapon intended to be used to destroy electrical and electronic facilities at a certain target.
For years, the US military has developed new generation weapons and has now made some impressive strides.