This video of a test of the "water deluge system" of the Apollo/Shuttle/Space X launch pad motivated me to find more information on Launch Pad 39a. In the foreground, we see the top of the water tower. Near the center of the background, we see the Vertical Assembly Building. My wife and I toured the inside of that building during the Apollo era. I read that it was closed to the public when the shuttle started using it because of the danger of the solid rocket booster segments stored in the building.
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This view shows the tower was moved along with the rocket. We can see some of the eight crawler tracks used to move it. I remember that Dirty Jobs did a segment that included lubricating those tracks. And then Mike Rowe drove the thing. It does 1 mph when loaded and 2 mph with no load.
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Space shuttles Atlantis (STS-125) and Endeavour (STS-400) on launch pads 39A and 39B before the Hubble servicing mission in 2008. Endeavour stands by in case of the unlikely event that a rescue mission is necessary during Atlantis' STS-125 mission to repair NASA's Hubble Space Telescope.
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Storm clouds roll in over Pad 39A on July 10, 2009 as space shuttle Endeavour stands awaiting the launch of STS-127. [The History of Shuttle Launch Delays]