Hartford is a geographically unique planet featuring a plasma molten outer core surrounding an inner core which is composed primarily of a nickel-iron alloy, with very small amounts of other elements. These elements were found in abundance in other chemical compositions in the galaxy, but it is the unique properties of the plasma which interested astrophysicists, plasma which the humans of Hartford harnessed to supply clean and efficient energy. Plasmic eruptions found their way to the porous crust of the planet, affecting geographic features there such as mountain chains and plate tectonics.