ron mcnair, followed by mike smith and greg jarvis. >> 30 years ago, january 28, 1986, the space shuttle challenger exploded 73 seconds after liftoff, taking the lives of the seven crew members pictured here. next on "reel america," a nasa report detailing the causes of the disaster. the conclusions are the findings released on june 6 of 1986. but first, the nasa video of the shuttle launch, followed by president reagan's remarks to the nation from the oval office five hours after the accident. >> t -15 seconds. t -10, 9, 8, 7, 6 -- we have main engine start. 4, 3, 2, 1, and liftoff. liftoff, the 25th spatial mission has cleared the tower. >> confirmed. challenger now heading downrange. engines have begun throttling down now. 94%. normal throttle for most of the plane. will throttle down to 65% shortly. engines at 65%, three engines running normally. velocity, three nautical miles, downrange distance three. engine is throttling up. 104%. >> challenger, go at throttle up. >> roger. >> one minute 15 seconds. altitude, nine nautical miles. down-range distance -- seven nautical miles. flight

ron mcnair, followed by mike smith and greg jarvis. >> 30 years ago, january 28, 1986, the space shuttle challenger exploded 73 seconds after liftoff, taking the lives of the seven crew members pictured here. next on "reel america," a nasa report detailing the causes of the disaster. the conclu