Tin foil hats
For starters, we don't know what forced us from our home. The information is missing from the archives, with evidence indicating it was not only intentionally removed, but those responsible didn't even bother to cover their tracks. We know it was the earthborn, and they couldn't care less whether we know or not. Some believe we destroyed the planet's environment, along with that of a few colonies in the origin system. Others believe an external force was involved, perhaps an extinction event arrived early on old blue. Maybe someone wanted the earth more than we did, and if they couldn't have it, no one would. Maybe we discovered some horrible truth that made leaving the system a viable option. There are some who believe theology may grant the answers we seek. Maybe we fell victim to a cruel and angry god, indifferent to our suffering. In the end, it doesn't really matter. The records have been purged, and the earthborn are tight-lipped. I fear we may never know what truly happened.
Fact and fiction
I've spent so long speaking about what we don't know perhaps I should reveal some of the things we do. We know that the earth died quickly. We know it's nestled in a distant system far away from Safeharbor. We know that humans were just beginning to master spaceflight at the time, and we know the majority of those who left were carefully chosen, sequestered aboard arks that were never designed to leave the system. We may have left in a hurry, but it takes time to make a list of those who left. We know there wasn't an invasion, or at least we feel it's safe to assume. No species capable of it would have been sloppy enough to let so many humans get away. We also know there wasn't a war among ourselves. Humanity was capable of many feats in the art of war, but war is not what consumed us. The records state we were in an unprecedented time of peace. Of course, the record were tampered with before. Perhaps we know nothing at all. The Origin Exiles speak rather curious tales about the fall of earth. The evidence supports their account. There were many factors that led to our downfall, but a single event sealed our fate. This event was their doing, though the event changes depending on who you ask. "We broke into heaven," they say. They refuse to shed light on what the phrase means. Every human knows it. Whether it references a physical place or is meant to be figurative. The best theory I can muster is this: It seems we ventured where humanity was simply not meant to go.
The only way the two can share a secret is if one of the two are dead. This adage appears to be flawed. The earthborn are an entire generation, all privy to the truth, yet none can bear to speak it. What cruelty, what unbearable experience could so efficiently haunt one's memory? Those who want to know, Wayfarers and myself included, urge our elders to regrow a spine as soon as it is convenient. They aren't as young as they once were. The earthborn are slowly fading behind that thick black curtain we call death. If they all die, it would take finding earth to learn the truth, and that assumes theirs an earth left to find. We know it hurts. We see their faces every time we ask about it. They are deeply scarred by the earth's passing. Their faces soften, their eyes glaze over, and some linger in a depression for weeks. It got to a point where we just stopped asking. We accepted their lies to spare them from their demons.