Forty years ago this past week, Americans watched in horror as the Space Shuttle Challenger exploded on live television just 73 seconds after liftoff, killing all seven crew members.

An investigation later found that during the coldest-ever shuttle launch, a failure in the O-ring seals—caused in part by the weather—led to the disaster. Hours after the tragedy, President Reagan addressed the nation, calling the crew heroes and vowing that the disaster would not end America’s space program.

Earlier this week, retired NASA astronauts Bonnie Dunbar and Clayton Anderson joined FOX News Rundown host Dave Anthony to reflect on the lives of the seven heroes lost, the evolution of safety protocols following the investigation, and the unwavering spirit of discovery required to reach for the Moon and Mars.

We often must cut interviews short during the week, but we thought you might like to hear the full conversation.

Today on The FOX News Rundown Extra, we share our entire interview with retired NASA astronauts Bonnie Dunbar and Clayton Anderson.

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