NASA remembers the Challenger disaster 25 years later

… Today, NASA marked the 25th anniversary of the Challenger disaster which ended the lives of seven astronauts including the first teacher in space, Christa McAuliffe, due to a midair explosion 76 seconds into its flight. In honor of the heroes of STS-51-L, a memorial was dedicated in the Arlington National Cemetery where some remains of the crew members were buried. …