for the backup. In my opinion, a solar fusion/fission reactor could power an entire city, or a large ship that we could use to explore the universe. In the sun, fusion occurs when electrons are bombarded into Hydrogen atoms creating helium atoms and releasing energy in the form of photons, the opposite reaction, fission, occurs on the inner part of the sun where a electon is forced out of a helium atom and made into a hydrogen atom. This occurs at extremely high pressure and temperature. If we could find a way of sustaining these chain reactions in a controlled environment, we could have a source of power that could be used for many things.