It was a sight Americans will never forget.
Twenty years ago tomorrow, space shuttle Challenger blew apart 73 seconds after blasting off from Florida, killing all seven astronauts on board. Among them was Christa McAuliffe, who was to have been the first teacher in space.
Commander Dick Scobee (SKOH'-bee), pilot Mike Smith and astronauts Ellison Onizuka, Judy Resnik, Ron McNair and Greg Jarvis also died.
Challenger was brought down by a poorly designed seal in the shuttle's solid rocket booster.
Tomorrow, a ceremony remembering the Challenger accident is planned at the Kennedy Space Center. NASA workers paused yesterday to remember the crews of Challenger and Columbia and the three astronauts who died in an Apollo launchpad fire.