Intro: Deep beneath the frigid waters of Baffin Bay near Greenland, microscopic grains of alien dust have been discovered that provide startling new evidence for one of archaeology's most controversial theories. A study published in PLOS One has uncovered geochemical signatures of a comet explosion that rocked Earth 12,800 years ago, offering the second major scientific validation in recent weeks for the Younger Dryas Impact hypothesis. This ocean-floor evidence adds to the growing body of terrestrial impact markers found worldwide.