NASA's space shuttle Challenger completed 10 missions before it broke apart during a launch in 1986, killing seven astronauts.

(CNN) - Wednesday marks the 40th anniversary of the Challenger space shuttle explosion. It was a moment of collective grief on Jan. 28, 1986, when the space shuttle exploded during a live broadcast.

Today marks the 40th anniversary of the Space Shuttle Challenger explosion.

On Jan. 28, 1986, America witnessed a tragedy: the explosion of Space Shuttle Challenger in the blue skies over Florida. The doomed shuttle touched us like we have never been touched before because along with the tragic loss of astronauts, a teacher was on board.

From Mercury & Apollo Missions to the Space Shuttle Program, Mars Rover Landings, & Artemis II.

NASA Administrator Jared Isaacman appeared to suggest that space shuttle Discovery may not be relocated to Houston's Johnson Space Center in Texas.

A Tyler doctor’s photo landed him in the history books when he captured one of our nation’s tragedies.

Forty years ago, the space shuttle Challenger exploded 73 seconds after liftoff. Seven astronauts were killed, including teacher-in-space Christa McAuliffe. It was a devastating blow to the U.S. space program and a national tragedy for the country.