BOSTON (CBS) – Monday marks a tragic anniversary in American history.

The Space Shuttle Challenger exploded 33 years ago on January 28, 1986.

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The space shuttle Challenger lifts off on January 28, 1986 from the Kennedy Space Center. (By Bob Pearson/AFP/Getty Images)

It happened just 73 seconds after liftoff from the Kennedy Space Center in Florida.

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Seven astronauts died, including Christa McAuliffe, the Framingham native and Concord, New Hampshire teacher who was going to become the first teacher in space.

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Christa McAuliffe. (Photo By Nasa/Getty Images)

Investigators later determined that a rocket booster failure caused the fuel tank to ignite.