What Would Happen If A Nuclear Bomb Explodes In Space?

First of all, let’s understand how a nuclear bomb works. Its core has fissile material. When detonating, a part of this material turns into energy (remember the famous Einstein equation?). Most of this energy is released as gamma rays, the most energetic of all. When this happens, immediately, the weapon itself disintegrates, because the energy of the gamma rays heats it to the point of turning it into plasma.

It happens inside the atmosphere, and it happens in space.