Asteroid headed toward Earth? NASA simulation explores how the nation might respond

Imagine if scientists discovered a giant asteroid with a 72% chance of hitting the Earth in about 14 years — a space rock so big that it could not only take out a city but devastate a whole region.

This is the hypothetical scenario that asteroid experts, NASA workers, federal emergency management officials, and their international partners recently discussed as part of a table-top simulation designed to improve the nation’s ability to respond to future asteroid threats, according to a report just released by the space agency.