The tragic explosion of the Challenger space shuttle occurred 40 years ago

Every weekday at 9:20 A-M on KCBS we're giving you direct access to top experts in various fields. On this day 40 years ago, the Space Shuttle Challenger exploded 73 seconds into its flight, killing all seven crew members aboard. The tragedy has shaped space exploration and public perception in the decades since, and to tell us more KCBS News Anchor Steve Scott spoke with Dr. Scott Hubbard, former Director of NASA’s Ames Research Center.