The untold story behind the devastating mission. The CNN Original Series Space Shuttle Columbia: The Final Flight premieres Sunday, April 7 at 9p ET/PT on CNN. | CNN

35 YEARS LATER: On this day in 1986, the Space Shuttle Challenger exploded after liftoff, killing all seven astronauts on board. The Challenger broke apart at 11:39 a.m., falling into the Atlantic Ocean. Investigators would later discover the disaster was caused by the failure of an “O ring” seal in one of the two solid-fuel rockets. As a result of the horrific accident, NASA did not send astronauts into space for more than two years as it redesigned a number of space shuttle features for improv

Today we remember the seven astronauts killed in the Columbia space shuttle disaster: https://bit.ly/2S1sDAU | WESH 2 News

The families of Shuttle Columbia’s crew watch as they launch into space. 🚀 THE SPACE SHUTTLE THAT FELL TO EARTH: 2003 - millions watch live as Columbia breaks up in the sky over Texas, killing all on board. NASA, loved ones and investigators share how an incredible journey ended in tragedy. #Space #Rocket #Moon #NASA #Documentary #Throwback | BBC One