HOUSTON, Texas (CNN) -- Seven astronauts were killed today when space shuttle Columbia broke up about 38 miles above Texas on its way to Kennedy Space Center in Florida.
President Bush said in a televised address to the nation Saturday the news had brought "great sadness to our country," but pledged, "Our journey into space will go on."
"These men and women assumed great risk in the service of all of humanity," Bush said. "In an age when space flight has come to seem almost routine, it is easy to overlook dangers. ... These astronauts knew the dangers and faced them willingly."
"The loss of this valiant crew is something we will never be able to get over".
Flags at the White House and NASA headquarters were lowered to half-staff in tribute to the crew.
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