30 years later: What the Challenger tragedy can teach today's private space explorers

Video: Chris Grasinger Thirty years ago today, the Space Shuttle Challenger exploded shortly after liftoff on a clear, cold morning in Florida School teacher Sharon Christa McAuliffe, astronauts Gregory Jarvis, Judith Resnik, Francis Scobee, Ronald McNair, Mike Smith and Ellison Onizuka died in the accident. While that tragedy wasn't NASA's first, it still shook the foundation of the space agency, forcing engineers and scientists to reevaluate the ways they fly people to space. The direct cause ...