For decades, scientists debated the cause. Was it volcanoes? An asteroid? But a leading theory suggests the killer wasn't from Earth at all. It was a Gamma-Ray Burst (GRB). A GRB is the most powerful explosion in the universe, usually caused by the collapse of a massive star (a hypernova). The theory proposes that a star within 6,000 light-years of Earth exploded, firing a focused jet of high-energy radiation directly at us. The burst would have lasted only ten seconds, but that was enough. When

35K views · 365 reactions | A hypernova could be less deadly than a supernova? Well for some lucky planets. ☄️ #BadUniverse | Discovery Channel UK | Facebook