It's been 40 years since the space shuttle Challenger exploded shortly after liftoff Jan. 28, 1986, in Florida, killing all ...

We're asking readers to share their memories on one of those "Where were you when ... " type of moments in American history.

Forty years ago, the space shuttle Challenger exploded 73 seconds after liftoff. Seven astronauts were killed, including ...

Forty years after the Challenger disaster, NPR explores the engineers' last-minute efforts to stop the launch, their decades ...

For 73 seconds, a crowd of excited Americans looked to the sky in wonder and awe as they waved goodbye to the crew aboard ...

It was 40 years ago this week that many of us witnessed those fateful 73 seconds of Challenger's final flight. Let's remember those we lost that day.