Columbia, the oldest shuttle in the fleet of four, was to have landed at a.m.

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Nacogdoches, Texas, police found pieces of debris inside the city limits and in the surrounding county.

Ramon had been a national hero in Israel for taking part in the 1981 bombing of a nuclear reactor in Iraq.

Brown, 46; Kalpana Chawla 41; and Laurel Clark, 41; and Israel's first astronaut, payload specialist Ilan Ramon, 47.

[click image to enlarge] NASA Entry Flight Director Leroy Cain declared a contingency for the shuttle Columbia at around a.m.

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NASA began to use all of its tracking facilities to look for Columbia, when communications had not restored by the time the shuttle had been scheduled to land.

The STS-107 mission was NASA's most scientifically ambitious spaceflight in years.

NASA warned residents under the shuttle's footprint, "If you find debris, please do not touch it, and if you have photos or videos that you think will be helpful, please contact your local police authorities." Three months later, NASA reported on April 26 that some 70,000 pieces of Columbia had been collected from the ground.

That amounted to about about 40 percent of the weight of the shuttle.

Anderson, all mission specialists; and Ilan Ramon, payload specialist from the Israeli Space Agency.