NASA paid tribute to all the late astronauts who died over the years when it commemorated the 20th anniversary of the space shuttle Columbia tragedy.

The Columbia disaster occurred on Feb. 1, 2003 when the space shuttle broke apart, killing its entire crew. An investigation led to changes in NASA procedures.

CAPE CANAVERAL, Fla. — NASA marked the 20th anniversary of the space shuttle Columbia tragedy with somber ceremonies and remembrances during its annual tribute to fallen astronauts on Thursday.

Feb. 1 marks the 20th anniversary of the tragic accident of the space shuttle Columbia, which killed seven astronauts. NASA's Kennedy Space Center in Florida paid its respects to the crew and ...

NASA marked the 20th anniversary of the space shuttle Columbia tragedy with somber ceremonies and remembrances during its annual tribute to fallen astronauts on Thursday.

NASA marked the 20th anniversary of the space shuttle Columbia tragedy with somber ceremonies and remembrances during its annual tribute to fallen astronauts on Thursday.

Columbia. Every January, NASA remembers its fallen heroes during this dark time of year. "Every year we gather to pay tribute to the lives lost in the pursuit of exploration and knowledge, ...

CAPE CANAVERAL, Fla. (AP) — NASA marked the 20th anniversary of the space shuttle Columbia tragedy with somber ceremonies and remembrances during its annual tribute to fallen astronauts on ...