The term “Black Sky” or “Black Sky Hazard” refers to an event that severely disrupts the normal functioning of our critical infrastructures. A Black Sky Hazard is a catastrophic event that severely disrupts the normal functioning of our critical infrastructures in multiple regions for long durations. Think electromagnetic pulse (EMP) or space weather in the form of a massive solar flare, for starters. Given the interconnected nature of today’s hyper-complex societies, a “BLACK SKY” event would “bring society to its knees” in very short order.