Today is the NASA Day of Remembrance 2013 honoring the astronauts who lost their lives in spaceflights. The day honors the crews of Apollo 1 (AS-204), Challenger (STS-51L) and Columbia (STS-107). Today is the 10th anniversary of the loss of Columbia.

NASA Administrator Charlie Bolden and Deputy Administrator Lori Garver will lay wreaths at Arlington National Cemetery this morning and an event will be held at the Kennedy Space Center Visitor Complex beginning at 10:00 am ET. NASA TV will cover the KSC event.

The day honors the three-man crew of Apollo 1 (AS-204) who died in a fire in their Apollo capsule during a pre-launch test on January 27, 1967. Pictured below left to right: Ed White, Virigil “Gus” Grisson, and Roger Chaffee. They were to be the first crew of the first Apollo mission. Photo: NASA.

The crew of space shuttle Challenger (STS-51L) who died when their space shuttle exploded 73 seconds after liftoff because an O-ring failied on a solid rocket booster on January 28, 1986. Pictured below left to right: front row – Mike Smith (NASA), Dick Scobee (NASA), Ron McNair (NASA); back row – Ellison Onizuka (NASA), Christa McAuliffe (teacher in space), Greg Jarvis (Hughes Aircraft), Judy Resnik (NASA). Photo: NASA

The crew of space shuttle Columbia (STS-107), who died when their shuttle disintegrated during its return to Earth on February 1, 2003 when superheated gases entered the shuttle’s wing through a hole punctured in it by a piece of foam that came off the External Tank during launch. Pictured below left to right: David Brown (NASA), Rick Husband (NASA), Laurel Clark (NASA), Kalpana Chawla (NASA), Michael Anderson (NASA), William McCool (NASA), Ilan Ramon (Israeli Air Force). Photo: NASA.