Tsar Bomba’s resulting destruction was significant. Today, there remains a lasting scar on the area where it was detonated.

The device would have had a yield approximately double that of the combined explosive power of all nuclear weapons in existence today.

And all this came from a 1.4 megaton bomb. Tsar Bomba, which was the largest nuclear bomb that has ever been detonated, was 50 megatons. So what would happen if we detonated that above the United ...