WASHINGTON ‘ NASA on Thursday marked a day of remembrance for astronauts who have died in the line of duty, particularly the victims in the explosion of the space shuttle Challenger 25 years ago. Schoolchildren and space enthusiasts around the world watched live January 28, 1981 as the Challenger lifted off carrying seven astronauts including the first teacher, Christa McAuliffe, to…
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NASA marks 25 years after Challenger disaste