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CAPE CANAVERAL, Fla. – The emblem on the jacket of a guest at NASA's Kennedy Space Center Visitor Complex commemorates NASA's 'fallen heroes' whose names are etched on the Astronauts Memorial Foundation's Space Mirror Memorial, following a ceremony on the 28th anniversary of the space shuttle Challenger accident. The day of the accident in 1986 dawned bitterly cold. Temperatures hovered just a few degrees above freezing as Challenger and its seven astronauts lifted off on the STS-51L mission. The flight ended just 73 seconds later when an O-ring in the right solid rocket booster failed, causing a fireball that led to the loss of the vehicle and crew: Commander Francis Scobee, Pilot Michael Smith, Mission Specialists Judith Resnik, Ellison Onizuka and Ronald McNair, and Payload Specialists Gregory Jarvis and Sharon Christa McAuliffe, a teacher. To learn more about the Space Shuttle Program, visit http:__www.nasa.gov_mission_pages_shuttle_main_index.html. To read the astronauts' NASA biographies, visit http:__www.jsc.nasa.gov_Bios_astrobio_former.html. For information about the AMF, visit http:__www.astronautsmemorial.org_home.html. Photo credit: NASA_Dimitri Gerondidakis