For untold millennia, comets and asteroids have struck fear into the hearts of humankind. Their stark radiance was observed everywhere with a sense of impending doom and interpreted as signs of the gods' judgment, omens of plague, mass destruction and the end of time. Astronomers recorded their appearance the world over, building large scale observatories to track their movements and predict their ominous arrival. What was it about these majestic wonders of the heavens that inspired such dread? Was it simply a product of mere superstition and social hysteria? The latest scientific analysis and historical analysis strongly suggest otherwise. Our ancestors knew something we have since forgotten, their secrets deeply embedded in the archaeological record and the myths passed on throughout generations. And we have only begun to unravel their mysteries ... Spurred by the discovery of a little known letter of warning to the European Office of Aerospace Research and Development by astrophysicist Victor Clube, author Laura Knight-Jadczyk began an in-depth research project to get to the bottom of the very real threat to humanity posed by these celestial visitors. In The Apocalypse: Comets, Asteroids, and Cyclical Catastrophes, Knight-Jadczyk shares what she found: historical evidence for mass destructions, comet-borne plagues, and repeated cover ups littering our past, as well as clues that a similar fate may be fast approaching.