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Open Image ModalOn January 28, 1986, space shuttle Challenger exploded 73 seconds after its take-off from Kennedy Space Center in Cap Canaveral, Florida, On the picture, Challenger's crew. (credit:Photo 12/Getty Images)
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Open Image ModalTeacher and space shuttle astronaut, Sharon Christa McAuliffe, is shown in an undated official portrait released by NASA. McAuliffe and the entire Space Shuttle Challenger crew were lost seventy three seconds after launch when a booster rocket failed. (credit:NASA/Getty Images)
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Open Image ModalSpace Shuttle Challenger peering out from heavy mist as it makes its way to the launchpad ahead of its launch on 28 January 1986, at Kennedy Space Center, Florida, USA, in January 1986. The launch of STS-51-L ended in tragedy when the shuttle disintegrated over the Atlantic Ocean, off the coast of central Florida, resulting in the deaths of Michael J. Smith, Dick Scobee, Ronald McNair, Ellison Onizuka, Christa McAuliffe, Gregory Jarvis, and Judith Resnik. (credit:Space Frontiers/Getty Images)
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Open Image Modal28th January 1986: The space shuttle Challenger (STS-51L) takes off from the Kennedy Space Centre, Florida. 73 seconds later the shuttle exploded, killing its seven crew members. (credit:MPI/Getty Images)
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Open Image ModalOn January 28, 1986, space shuttle Challenger exploded 73 seconds after its take-off from Kennedy Space Center in Cap Canaveral, Florida, On the picture, the shutte just before the explosion. (credit:Photo 12/Getty Images)
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Open Image ModalThe Space Shuttle Challenger explodes minutes after takeoff January 28, 1986 from Kennedy Space Flight Center at Cape Canaveral, Florida. All seven aboard were killed including Christa McAuliffe who had won a nationwide competition to be the first teacher in space. (credit:CNN/Getty Images)
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Open Image ModalSpace Shuttle 'Challenger' Tragedy Coverage (On TV Screen) - Airdate: January 28, 1986. (credit:ABC Photo Archives/Getty Images)
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Open Image ModalFrederick Gregory (foreground) and Richard O Covey, spacecraft communicators at Mission Control in Houston watch helplessly as the Challenger shuttle explodes on take-off, killing all seven members of its crew, 28th January 1986. STS-51-L was Challenger's tenth launch, and was scheduled to include the first Teacher In Space Project. (credit:Space Frontiers/Getty Images)
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Open Image ModalSpace Shuttle Challenger crew members gather for an official portrait November 11, 1985 in an unspecified location. (Back, L-R) Mission Specialist Ellison S. Onizuka, Teacher-in-Space participant Sharon Christa McAuliffe, Payload Specialist Greg Jarvis and mission specialist Judy Resnick. (Front, L-R) Pilot Mike Smith, commander Dick Scobee and mission specialist Ron McNair. The Challenger and its seven member crew were lost seventy three seconds after launch when a booster rocket failed. (credit:NASA/Getty Images)
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Open Image ModalTwo unidentified spectators at the Kennedy Space Center react after they witnessed the explosion of the space shuttle Challenger, Jan. 28, 1986. The shuttle, which carried a crew of seven, exploded just moments after takeoff. (credit:AP)
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Open Image ModalThis Jan. 28, 1986 file picture shows U.S. President Ronald Reagan in the Oval Office of the White House after a televised address to the nation about the space shuttle Challenger explosion. (credit:Dennis Cook/AP)
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Open Image ModalTraders at Chicago?s Mercantile Exchange halt their normally frenzied trading at 10:00 a.m. on Wednesday, Jan. 29, 1986 to honor, in silence, elementary school teacher Christa McAuliffe and the six astronauts who were killed when the space shuttle Challenger exploded and disintegrated after takeoff. All was quiet for a full minute. (credit:Charlie Knoblock/AP)
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Open Image ModalCoast Guardsmen hoist the right front section of the space shuttle Challenger from the Atlantic Ocean onto the Coast Guard cutter Dallas during salvage operations off the Florida coast, January 31, 1986. The Challenger exploded seconds after take-off on January 28. (credit:AP)
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Open Image ModalRichard Greene adjusts a letter as he sets up a billboard outside a Concord, New Hampshire motel on Thursday, Jan. 30, 1986. Teacher Christa McAuliffe, who taught at Concord High School, was a crewmember aboard the ill-fated Space Shuttle Challenger. (credit:Peter Southwick/AP)