Word: launchful
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Shivering reporters, photographers, schoolchildren and other spectators cheered. The countdown was past the point where it had stopped the day before. The mission designed to show that space belonged to everyone finally seemed ready to launch both its schoolteacher and the dreams of the children participating vicariously from their schools. On Challenger's flight deck, roughly the size of a Boeing 747's, Scobee and Smith continued to run through their elaborate checklists. The orbiter's main computer, supported by four backups, continuously scanned all the data from some 2,000 sensors and data points. They would shut down...
...launch platform was about to be flooded by powerful streams of water gushing from six pipes fully 7 ft. in diameter. The purpose: to damp the lift- off sound levels from Challenger's three engines. Otherwise, the acoustic energy alone could damage the craft's underside. The main-engine firing sequence was turned over to computers...
Even then the onboard computer, sensing the slightest glitch, could still abort a launch. As it happened, Resnik had been aboard the shuttle Discovery in June 1984 when, four seconds before the spacecraft's three main engines were to ignite for lift-off, the computer noted that the thrust from one of them was not at the proper level. The fuse was immediately pinched...
...Houston intently monitored Challenger's roaring ascent for a different reason. It is the most critical and most dangerous phase of a space mission. "When you have that much power, you have to respect it," said Flight Director Jay Greene in Houston. "If you get complacent about the launch phase, you don't understand what's going on." In the shuttle, the crew was about to be jammed back into their couches by three times the force of gravity. Their immediate fate was out of their hands...
...would happen to somebody else." Recalled Ohio Democrat John Glenn, the first American to orbit the earth: "We used to speculate, the first group of seven, how many of us would be alive after the program." (One of them, Gus Grissom, died in a 1967 fire on a launch pad.) His voice thick, he added, "We always knew there would be a day like this. We're dealing with speeds and powers and complexities we've never dealt with before. This was a day we wish we could kick back forever...