"Describing the scenario as a ‘not if – but when,’ NASA recently simulated what would happen if a 300 to 800ft asteroid* approached Los Angeles with an 100% chance of impact. ‘It’s not a matter of if – but when – we will deal with such a situation,’ said Thomas Zurbuchen, Associate Administrator for NASA’s Science Mission Directorate in Washington...The simulation took place in El Segundo, California on October 25 – and looked at how emergency planners would respond to the scenario."