found this on aol:
SEVEN astronauts have died after Space Shuttle Columbia disintegrated over Texas.
Nasa lost contact with the shuttle as it re-entered the Earth's atmosphere, minutes before its scheduled landing at the at the Kennedy Space Centre in Florida.
Six Americans and Israel's first astronaut were on board for the 16-day scientific research mission.
There were reports of an explosion and smoke. Nasa said it had received reports that the space shuttle had broken up during its descent, and that debris had fallen about 100 miles south of Dallas.
A senior US official, speaking on condition of anonymity, said no threat had been made against the flight, and the shuttle was out of range of surface-to-air missiles.
The astronauts who died were Americans Rick Husband, 45, Pilot William McCool, 41, Michael Anderson, 43, Kalpana Chawla, 41, David Brown, 46, Laurel Clark, 41, and Israeli Ilan Ramon, 48.
The craft had been due to touch down in Florida at 1416 GMT, and was at an altitude of 200,700ft and travelling at 12,500mph when communication went silent.
One witness, John Ferolito, 60, of north of Dallas, said: "I was getting ready to go out and I heard a big bang and the windows shook in the house. I thought it was a sonic boom."
Columbia's crew had completed more than 80 scientific research experiments during their time in orbit.
In 42 years of human space flight, Nasa has never lost a space crew during landing, or the ride back to orbit. In 1986, space shuttle Challenger exploded shortly after lift-off.
Nasa said on Friday that damage to some of the shuttle's thermal tiles was believed to be minor and posed no safety concern.