Planetary Frontline 1: Matters of the World

In the parallel world's year 2125, humanity leaves Earth and takes its first step toward the stars. Scientists discover an unknown planet in the Milky Way. Tests show that it is suitable for human habitation, with a climate and environment virtually identical to Earth's. Humanity is stunned. All the countries on Earth unite to form the Earth Federation and jointly develop the planet, naming it Blue Star. By 2130, after five years of development, Blue Star has begun to resemble Earth. People build great cities there, and the Federation government announces that humanity can migrate to Blue Star to ease the strain on Earth. The new planet brings fresh materials, resources, energy, and living space. Earth's technology advances tremendously, and everything seems to be heading in a promising direction. However, in the parallel world's year 2135, the sky above Blue Star shudders, and a vast number of spaceships suddenly appear. Many beings resembling humans arrive on Blue Star and immediately declare their intention to seize the planet and use it as a base to attack Earth. Thus begins a war to defend Blue Star and Earth, a war between humanity and the aliens... (This story is entirely fictional. Any resemblance to actual events is purely coincidental.)