What will happen if you detonate all the nuclear bombs on Earth at the same time.

The exact number of nuclear warheads is kept secret by the military of different countries, but it is customary to estimate them at 15,000 pieces. If we assume that each has a capacity of a megaton, and then evenly apply them to the most populated areas of the planet, it is possible to destroy 3 billion people overnight. And there will still be about 1,500 charges left. However, this apocalyptic scenario shows an important thing — even the mass use of nuclear weapons is not capable of destroying all people on the planet overnight. There will always be those who have been at sea, in mines, in remote areas, plus polar explorers and astronauts on the ISS. It is not even a fact that civilization as such will be destroyed — except that it will be discarded for a couple of centuries in development. Moreover, if all nuclear weapons are concentrated on one continent, it will be possible to see a monstrous fireball with a diameter of 50 km during its explosion, but little will change outside the continent after the end of the nuclear winter.