This is cool: the test firing of SpaceX's SuperDraco engine, which will be used in case of an emergency during launch to propel the Dragon space capsule to safety. Basically, if there's a problem that happens during launch, 8 of these engines will fire, and the capsule will be shot away from the rocket at high speed. Apollo had a system like this, but the Shuttle did not (in fact, being on top of a rocket stack is far safer, and this is one of the reasons; it's easier to get away if needed). SpaceX needs to have this system in place to pass NASA's requirements for human safety during launches.
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