A 2013 meteor explosion above Chelyabinsk, Russia injured more than 1,700 people. It was completely unexpected -- and it could happen again. Here's what NASA's doing to make sure we know how to act when (not if) the next one hits. Read Mashable's in-depth coverage of The Hunt for Killer Asteroids: mashable.com/2014/01/28/asteroid-tracking/ For more videos about space, science, and the future, subscribe to Mashable at the link below: www.youtube.com/subscription_center?add_user=mashable Mashable is the leading independent news site for all things tech, social media, and internet culture. MUSIC: "Oxygen Garden" by Chris Zabriskie, 2011 "Spheres" by Doxent, 2013 This piece includes footage courtesy of Launchpad Entertainment. Russian Meteorite Shockwave Panic 2445 youtu.be/9DaHgVDvBFM Chelyabinsk Meteorite Crosses Sky youtu.be/JJUYAzAXHLI www.mashable.com LIKE us on FACEBOOK: facebook.com/mashable.video FOLLOW us on TWITTER: twitter.com/mashablevideo FOLLOW us on TUMBLR: mashable.tumblr.com FOLLOW our INSTAGRAM: instagram.com/mashable JOIN our circle on GOOGLE PLUS: plus.google.com/+Mashable Subscribe!: bit.ly/1ko5eNd Mashable is the leading independent news site for all things tech, social media, and internet culture. www.youtube.com/mashable