The unsettling reasons no one saw the Chelyabinsk meteor over Russia coming - and why it could happen again

In 2013, a fireball exploded over Chelyabinsk, Russia. No one saw it coming. Even though NASA has been able to identify over 14,000 near-earth objects, its asteroid tracking technology is not completely ready to see everything that heads towards the Earth.

NASA's Planetary Defense Coordination Officer Lindley Johnson told $4 about the unsettling reasons why.

Produced by$4 and $4

Follow BI Video: $4