Before a rocket can blast off into space, it must travel 4.2 miles from the Vehicle Assembly Building to the launchpad in Cape Canaveral, Florida. That's where NASA's crawler-transporters come in. They're the largest self-powered vehicles on the planet, and they're designed to transport rockets to the launchpad. We got an inside look at how NASA's preparing and operating the crawler for the 16-million-pound mobile launcher and Space Launch System, NASA's largest and heaviest rocket to date.

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How NASA Drives The $144 Million Vehicle That Transports Rocket Ships | What It Takes