66 million years ago a giant space rock crashed into our planet and killed the dinosaurs. In the span of just four decades, we’ve gone from not knowing there was a space rock at all to knowing exactly where that planet-killer came from.

Join me on a wild tour through a hypothetical apocalypse -- and see what it would take for humanity to cling on through the worst disaster in the last 250 million years.

Everyone knows that a giant rock from outer space hit the planet millions of years ago and wiped out the dinosaurs. Now with advanced technology, researchers have been able to put together a new timeline showing what really happened.