Editing Joshua Pawlicki's Explanation of How It Works (section)

===''Fusion Reactor''===
The fusion reactor is the power source for the ship. By using a compressed artificial gravity field, it creates the pressure of a star and fires superheated hydrogen isotopes (specifically deuterium and tritium), which combine to form a helium atom and a free neutron that contains enormous energy (more than enough energy required to combine two more atoms). Ultimately, it's a self contained power generation system that requires hydrogen fuel and exhausts helium. This energy is used to superheat a plasmatic substance that is used as a medium (or a vector fluid) to heat up water in another chamber. The water evaporates, and the steam pressure turns a turbine that generates electricity. Look up Nuclear Fusion for more. There are two ways to fuel this: H2O packs, small backpack-sized tanks of specialized water, or the longer-term fuel cell (described in the book), which is basically a bunch of regulated  H2O packs. You have to switch it less often and it's slightly safer, so most mechanics prefer the fuel cell over the individual packs.
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