Humanity extinction by asteroid impact

The risk of humanity extinction by giant asteroid impact is addressed. A 100 km sized may transform the Earth into an inhospitable planet, thus causing many life forms including human species. exact reason for such a result remains nevertheless uncertain. Based on Moon crater history and NEA observations, probability between 0.03 0.3 next billion years. However, as warning time would be in general relatively long, could have to settle other planets with high success. greatest threat come from long period comets. We show that comet 2.2 × 10-12 hundred years very short time. Many possible causes lead degradation support during decades following impact. It lack energy or important resources, catastrophic events, conflicts inefficient organization preparatory phase also play role. All all, highly probable though not totally sure.