Writing Prompt #654

Writing Prompt #654A thousand years ago, a rapidly progressing Ice Age forced humanity to abandon Earth. Ten massive ships carrying millions of people were launched into space to escape the devastation and have orbited the frozen planet ever since. Over the years, these ships have become nations onto themselves, developing separate militaries and engaging in wars with one another. As another conflict brews between two ship-nations, you receive a faint radio signal from the Earth's surface. You decide to investigate it further despite the orders of your superior officer.