Mysteries of the Universe by J.C. Vintner
Approx. 25,570 words.
Published on July 20, 2012.
Imagine what an epic impact this would have if mankind discovered not only that we're not alone, but also that aliens are actually humans living in the distant reaches of the universe, who seeded Earth to ensure survival of the species outside of more dangerous areas. In the probability of quantum mechanics, this is one possible outcome.