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2120: Various wars on the earth eventually led to a large nuclear explosion, so that the entire earth was no longer civilized. The world was full of darkness, no light, no oceans, and no green space. All that was left now was muddy water that was severely polluted and undrinkable after a large nuclear explosion, and turbid air that was impossible to breathe. 2220: In response to the various uninhabitable environments on the earth, all the people who still survived have migrated to live in outer space. Some have migrated to other distant planets, and some have opened up new worlds in outer space, while a small number of survivors still live on the earth and can serve as temporary habitats. However, people living on various planets are constantly waging wars in order to compete for control of this space, causing this space to enter the fear of war for many years. 200 Years ago, humans on earth used light machine guns and rocket launchers. The most powerful ones were just cruise missiles. But 200 years later, today's outer space wars have used death ray guns and laser cannons. The range of these weapons can often reach hundreds of kilometers, and no area or creature hit is spared. The war here is endless and endless, and you can be buried in outer space at any time. Your soul will continue to float in outer space and remain in the universe forever. But the only ones who continue to adhere to principles and uphold interstellar law are the federal troops on Earth and the Walton mothership full of refugees.