Earth is an exploited and destroyed planet. All were in upheavel. The Ceres wars, excessive environmental pollution, global warming and the contaminated radiation that enters through a perforated atmosphere, have turned this once blue planet into a grayish-brownish sphere of sludge.
Earth is in, and has begun to search for a new home.
Finally they make a strike in a distant part of space. In the course of various decades gigantic treks transport the majority of humanity to the planet Irata 3. Safety shields, artificial atmospheres and magnetic fields protect these cities against contaminated radiation that makes survival without a heavy protective gear outside the metropolis impossible. The three cities communicate with each other and with the new world of Irata 3 via satellites in Earth's orbit. Earth's aerospace research and spaceship production has been closed down and re-located to Irata 3.