Name: Earth at risk? How scientists track dangerous asteroids
Uploaded: Mon Jun 29 2015 12:07:00 GMT+0000 (UTC)
Duration: 3 min 22 s
Description: An undetected meteorite crashed into Russia in 2013. Could it happen again? NBC’s Keir Simmons talks to a Russian scientist and a NASA expert as he investigates what’s being done to protect our planet from potentially devastating collisions with meteors and asteroids.

June 29, 201503:22