Key points from article :
Rare for asteroids to survive passage through the atmosphere to cause damage.
Lindley Johnson is NASA’s Planetary Defense Officer.
Was for several years the sole member of NASA’s Near Earth Object Observation program.
Responsibilities fall into three main categories: detection, deflection, and emergency preparedness.
In 2020, NASA will launch the Asteroid Impact and Deflection Assessment (AIDA).
This will ram a spacecraft into a binary asteroid system to test our planetary defence apparatus.
