Yes. The so called "fireball" of a nuclear explosion is the spherical region of space where everything is completely vaporized in miliseconds. It's between 500

Yes. The so called "fireball" of a nuclear explosion is the spherical region of space where everything is completely vaporized in miliseconds. It's between 500 m - 5 km diameter depending on yield. At the same time, the long term danger of nuclear winter was supposedly overstated to scare the politicians into not using nukes.