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Byline: John Dorschner
MIAMI _ With the hull glowing at temperatures of up to 3,000 degrees, the hottest point in a shuttle's descent comes 20 minutes before landing _ just about the time when Columbia was found to be in trouble Saturday.
At a NASA press conference, spokesmen said Kennedy Space Center lost Columbia on its radar about 16 minutes before landing.
It was in the midst of an excruciating series of precise actions _ each of which is necessary for the ship to land safely.
For about 40 minutes after any standard re-entry, the shuttle becomes a 200,000-pound glider, impossible to control, zooming downward at speeds up to 17,000 mph, as it seeks to hit a tiny runway halfway round the globe ...