. "broke up on reentry" . . "exploded" . "destruction" . "orbiter's loss" . "Columbia Disaster" . . "Re-entry breakup" . "Space Shuttle ''Columbia'' disaster" . "Columbia shuttle accident" . "second shuttle loss" . "disintegrated" . "re-entry failure, 7 fatalities" . "''Columbia'' spacecraft breakup" . "disintegration during reentry" . . . "Shuttle destroyed during re-entry on February 1, 2003 and all seven astronauts on board killed" . "destruction of Orbiter Columbia" . . "Columbia" . "re-entry accident" . "''Columbia'' disintegrated upon reentry" . "disintegrated upon reentry" . . . "Space_Shuttle_Columbia_disaster" . "loss of the shuttle Columbia in 2003" . "''Columbia'' Shuttle disaster" . "Space Shuttle ''Columbia '' disaster" . . "Columbia accident" . "Destroyed in flight" . . "Space Shuttle Columbia is destroyed" . . "was destroyed" . "destroyed during re-entry" . "'' Columbia'' accident" . "loss of Space Shuttle ''Columbia''" . "died in 2003" . "sustaining similar damage in 2003" . "Space Shuttle ''Columbia'' disintegrates during reentry" . "''Columbia'' broke up on reentry" . "disintegrated during re-entry" . "Disintegrated during re-entry" . "Shuttle ''Columbia'' disaster" . "occurred on 1 February 2003" . "ill-fated ''Columbia'' mission" . "STS-107 ''Columbia'' loss" . . "broke up" . "Space Shuttle Columbia" . "Columbia's Final Flight" . "resulting investigation and modifications" . "NASA Columbia Memorial" . "disaster" . "doom ''Columbia'' in 2003" . . "post-''Columbia''" . "broke apart during reentry" . "Space Shuttle ''Columbia'' accident" . "crash" . . . . "loss of ''Columbia''" . "re-entry disaster" . "''Columbia'' reentry disintegration" . "disintegrating upon re-entry" . "prove fatal 15 years later" . "destruction of ''Columbia''" . "An in-flight break up" . "catastrophic destruction of ''Columbia''" . "loss of" . "breakup" . . "loss" . . "Broke up on reentry due to wing damage during launch" . . "loss of the Space Shuttle ''Columbia''" . "''Columbia'' Disaster" . "Columbia Space Shuttle disaster" . . "''Columbia'' disintegrated on reentry" . "disintegrated during the reentry" . "Space Shuttle Columbia disaster" . "Space Shuttle Columbia disaster" . . . "other memorials" . "space shuttle Columbia (STS-107)" . . "Space Shuttle Columbia disaster: Possible emergency procedures" . "broke up while returning to Earth" . "''Columbia'' accident" . "disintegrated 16 days later on re-entry" . . "accident" . "killed on reentry" . "STS-107" . "Lost during reentry, Space Shuttle ''Columbia'' disaster" . "Space Shuttle ''Columbia'' disintegrates" . "Columbia shuttle disaster" . . . "the shuttle had disintegrated over Texas" . "return-flight disaster" . . "Broke up during re-entry with loss of all crew." . . . "disastrous loss" . "the ''Columbia'' disaster" . "its crash" . "re-entry breakup" . . "disintegrates during reentry" . "''Columbia'' in 2003" . . "reentry disaster" . "disintegrates" . "disintegration" . "were killed in" . "Space Shuttle ''Columbia''" . "''Columbia'' Space Shuttle disaster" . "Columbia disaster" . "ill-fated" . "Space Shuttle STS-107 ''Columbia''" . . . "debris landed in the Nacogdoches area" . . . "Disintegrated during reentry" . "destroyed on reentry" . "'' Columbia'' disaster" . "loss of Space Shuttle Columbia" . "fatal mission" . . "STS-107 tragedy" . "his death" . "loss of the Space Shuttle ''Columbia'' and her crew" . "Space Shuttle Columbia crash" . "destroyed" . "disintegrated during reentry" . "''Columbia'' disaster" . "Shuttle Columbia tragedy" . "ill-fated STS-107 mission" . "''Columbia''" . . "2003 Space Shuttle ''Columbia'' disaster" .