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Briefly into a cloud, you could almost hear a quarter of a million gasps, until it reappeared in the bright blue sky. then "discovery" passed the 73-second mark, the moment "challenger" exploded. >> "discovery," go with throttle up. >> throttle go. >> reporter: the redesigned booster rockets had worked and the spent casings split off from the shuttle to drift to the sea for recovery. nasa was elated. even though they had launched more than an hour and a half late. >> and so be it, but i guarantee you, it was a keeper. the nasa managers indicated that despite their elation, they will never comp...

Unchts "discovery" houston you are go at throttle up. >> commander steve lindsey acknowledging the call, "discovery's" three main engines throttle back up. lindsey is joined by pilot eric bowen, al drew and nicole staunt. mission specialist mike barrett and steve bowen. "discovery's" three main engines are bulg a rate that would drain an average swimming pool at 35 seconds. they produce more than 7 million pounds of thrust. 1:50 into the flight we're standing by for separation of the twin solid rocket boosters, traveling, the altitude 24 miles, downrange from the

At throttle up. acknowledging the call from captain as "discovery's" three main engine throttle back up. lindsey is joined on the flight deck bowen drew and staunt. mission specialist mike barrett and steve bowen. "discovery's" three main engines burning rate average swimming pool 25 seconds. the engines combined with the solid rocket boosters produce more than 7 million pounds of thrust. one minute 50 seconds into the flight. we're standing by for separation of the twin solid rocket boosters. "discovery" traveling 2695 miles per hour. altitude 24 miles. down range from the kennedy space cente...

>> "challenger" go with throttle up. >> roger, go to throttle up. >> reporter: suddenly an explosion. >> controllers here looking very carefully at the situation. obviously, a major malfunction. >> reporter: nasa loses all communication with "challenger," but the crowd still does not realize that something's gone wrong. within seconds, "challenger" disintegrates. >> we have a report from flight dynamic officer that the vehicle exploded. >> reporter: for the spectators, joy turns to confusion. worry and a realization of tragedy. late this afternoon, after six hours of searching, nasa reports th...

Here's our coverage from "world news tonight" with peter jennings from our abc news vault. >> "challenger" go with throttle up. >> reporter: the space shuttle "challenger" is destroyed just a little more than one minute after lift-off. >> 1:16, velocity 2900 -- >> reporter: all seven astronauts on board are killed. president reagan has declared a week of mourning for the seven astronauts. five men and two women who lost their lives on their way into space this morning. we begin at cape canaveral with with abc's john quinones. >> reporter: they gathered for what turned out to be their last meal...