Unfortunately Endeavor’s launch has been called off, and postponed for at least three days. Faulty thermostat in one of its auxilliary power units, and another one acting ‘funny.’ The APUs provide the hydraulic pressure needed to operate a shuttle’s control systems during atmospheric flight. Technically a shuttle can operate with only one functioning, but launch rules require all three to be online before a shuttle can lift off. The most unfortunate thing is that 750,000 or so people were expected to show up today to watch it. Endeavor is getting quite the fanfare for its last voyage. Looks like many may miss the opportunity to see the launch afterall. I know I’m kind of bummed I’ll never get to see a launch or landing of one of these machines, at least not in person… though watching the launch from the cameras mounted on the fuel tank is pretty cool. Reply