A thermonuclear weapon is the most powerful type of explosive ever made. It’s like a normal nuclear bomb, but way bigger and much, much more dangerous! When the bomb is set off, a huge amount of energy is released. All the energy comes from the splitting of atoms inside the bomb itself. This type of energy is called nuclear energy, and it’s so powerful it can destroy whole cities in seconds. Thankfully, thermonuclear weapons are only used in extreme cases and are meant to be only used as a deterrent.