On Friday, February 1 -- the 10th anniversary of the Columbia accident -- NASA will pay tribute to the crews of Apollo 1 and space shuttles Challenger and Columbia with a Day of Remembrance. Flags across the agency will be flown at half-staff in their memory.

On January 27, 1967, Virgil “Gus” Grissom, Edward White and Roger Chaffee were killed in the Apollo 1 fire during a launch pad test. On January 28, 1986, Greg Jarvis, Ronald McNair, Ellison Onizuka, Judith Resnik, Michael Smith, Dick Scobee and Christa McAuliffe were killed when the space shuttle Challenger exploded just 73 seconds into its flight. On February 1, 2003, Rick Husband, William McCool, Michael Anderson, Kalpana Chawla, KD5ESI, David Brown, KC5ZTC, Laurel Clark, KC5ZSU, and Ilan Ramon -- were killed when the space shuttle Columbia disintegrated. According to ARISS International Chairman Frank Bauer, KA3HDO, Chawla served as the Astronaut Interface -- the liaison between NASA and the Amateur Radio on the International Space Station (ARISS) program -- before being selected for her mission on board Columbia.

NASA Administrator Charles Bolden and other NASA senior officials will hold an observance at Arlington National Cemetery on Friday morning, while NASA Television will provide live coverage of a wreath-laying ceremony at the Space Mirror Memorial, located in the Kennedy Space Center Visitor Complex in Florida, beginning at 10 AM (EST). You can watch live online on the NASA TV Public and Media channels, or on your television. Contact your local provider for the NASA TV channel in your area.