NASA's Day of Remembrance honors astronauts lost in exploration.

NASA will observe its annual Day of Remembrance on Jan. 22 to commemorate the crews of Apollo 1, Challenger and Columbia, with an observance at Arlington National Cemetery led by Administrator Jared Isaacman.

NASA will observe its annual Day of Remembrance on Thursday, Jan. 22, to honor agency members who lost their lives in the pursuit of space exploration. The observance commemorates the crews of Apollo 1 and the space shuttles Challenger and Columbia. Administrator Jared Isaacman will lead a ceremony at Arlington National Cemetery. Planned observances: - NASA Administrator Jared Isaacman said the agency pauses to honor those who lost their lives while pushing the boundaries of exploration, and that the observance is meant to respect risk and to learn. - An observance at Arlington National Cemetery is scheduled to begin with a wreath-laying at the Tomb of the Unknown Soldier, followed by remembrances for the Apollo 1, Challenger and Columbia crews. - Several NASA centers, including Johnson, Kennedy, Ames, Langley, Marshall and Stennis, will hold local ceremonies and commemorations on the Day of Remembrance. Summary: The Day of Remembrance brings together national and center-level ceremonies to mark past losses and recognize the families and colleagues of those who died in service. Undetermined at this time.