Many theories have been formed on how space stations should look, and how to provide energy for a space colony. The International Space Station will be powered firstly by fuel to launch the modules into orbit, Freeman Dyson [Permission given by Freeman Dyson] then solar energy will provide for the power in space. The solar energy will be collected, converted into electricity, and saved for use on board. A scientist, by the name of Freeman Dyson, created a theory much more advanced on how to power a space station. His theory, called the Dyson Sphere, is that a large shell would be constructed around a host star. This shell would ultimately catch 100% of the star's radiant energy. Space stations positioned around the star would be able to Bernal Sphere [Courtesy of NASA] collect and use the energy to power all activities needed for life. A popular theory on how a space station should be designed is the Bernal Sphere theory. In this theory the station would be built horizontally extending six and a half square kilometers, and weighing about five million tons. The radius of the sphere would be nine hundred meters across. The size of the structure would allow it to rotate at one revolution per minute artificially creating Earth-normal gravity at the center of the structure.