NASA's new defense roleCharleston Post CourierNASA estimates that the Chelyabinsk meteor was about 65 feet wide, and it released energy equivalent to at least 20 atomic bomb explosions.Lviv, Ukraine Fireball Meteor 23JAN2016 with VideosPosted: 25 Jan 2016 03:06 PM PSTLviv, Ukraine Fireball Meteor 23JAN2016 with Videos Screen Capture from Video Lviv, Ukraine Fireball Meteor 23JAN2016 M20160123