NASA's Annual Day of Remembrance today, Jan. 26, honors the astronauts who died during the Apollo 1 fire and the Challenger and Columbia space shuttle disasters.

NASA 'Day of Remembrance' marks 20 years since space shuttle Columbia tragedy

NASA Observes Day of Remembrance Ahead of Columbia 20th Anniversary

For NASA, a somber 'Day of Remembrance' casts spotlight on astronaut safety to prevent tragedies

NASA honors fallen astronauts with Day of Remembrance

NASA’s Day of Remembrance: Paying Tribute to Fallen Heroes

NASA Pays Tribute to Fallen Heroes with Day of Remembrance

In Remembrance of the Miss NASA Beauty Pageant