The setting of the Rainbow Cannon in the original book is only one 'distorting space-time within a radius of 100KM'. But after analyzing the principle specifically, you will find that this thing is terrifying. Space-time distortion is, by definition, the instability of gravity, that is, the redistribution of mass in that area. There are several ways to redistribute mass:

1. Mass and energy conversion.

Those who follow the rule of E=MC^2. How powerful is it? If not wasted, it would be more than enough to push the Earth into the orbit of Uranus.

2. Collapse

The object itself is affected by its own gravity, and it collapses because it cannot withstand the influence of its own gravity! If the mass is insufficient with the collapse required to maintain the formation of a black hole. The result is similar to 1

3. Simple high-temperature evaporation

Since the specific heat of the water is quite large, the underground facilities may be better this time, but the heat transfer of the water is very fast, and the scale of the flood will increase several times, accompanied by the evaporation of solid soot. And then there is the same tragedy that happened 65 million years ago. Humanity is not immune to this

4. Re-randomization

It can be understood as shuffling all the orders of the target, putting the contents of the area into the blender and mixing them back into place. Unfortunately, while the same tornadoes, volcanic eruptions, and downpours are being carried out, the world has to endure a giant tsunami tens of meters high.

5. Stretch to infinity

To put it simply, if you let everything here leave each other as a molecule, it will be a pretty gorgeous explosion visually, and imagine a high-pressure gas tank with a diameter of 200 kilometers, a match, Boom. The world is quiet. The atmosphere will be blown out of a hole no bigger than Australia's. This is a macroscopic giant fragmentation bomb, the early shock wave and splashed material from the explosion can instantly kill all living things in the vicinity of thousands of square kilometers, and all the water pushed by the explosion will form huge waves hundreds of meters high, and the rest is similar to the previous one.

There is also a theory that the operating principle of the rainbow cannon is close to that of a philosophical weapon, which is commonly known as a weapon of cause and effect, and that everything will not exist and will not exist within the range of the target hit. So please imagine the 'if phone booth' in Tinker, what a big bug it is, completely defenseless.

So compared to the rainbow cannon, the nuclear bomb is nothing more than a floating cloud. This is also the reason why many of his works mention that weapons of large-scale space destruction can only be used in outer space far from the planet unless necessary.