This close-up of a Space Shuttle taking off is truly out of this world — sorry but it's true

A viral Space Shuttle launch video reveals fascinating commentary by NASA aerospace engineers from shortly before the program's retirement in 2011.

The footage was originally released to the public by NASA's Glenn Research Center in a video titled"'Best of the Best' Provides New Views, Commentary of Shuttle Launches."

"What you're going to see is what I consider to be the best-of-the-best, state-of-the-art imagery, on both film and high-definition video, that the Space Shuttle program is capable of producing today," Melis says, introducing footage originally used in technical analyses. The footage captures the six seconds prior to liftoff, as the shuttle's main engines ignite, followed by the solid rocket booster, which detaches after launch and is retrieved and refurbished for subsequent missions.

Also notable are the flying sparks, which aren't used to ignite the fuel, as is commonly supposed. Instead these Radial Outward Firing Igniters are, according to Melis,"there to make sure any unburned hydrogen gets ignited before it floats around and collects some place where it can ignite later and cause problems."mission STS-117 and mission STS-124, which delivered a Japanese"Experiment Module" to the ISS.

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