Orbital Debris: History of Orbital Debris Knowledge Byte May 16, 2014 In this series, Nick Johnson, NASA's former chief scientist for Orbital Debris (OD), discusses orbital debris work at NASA. Johnson explains NASA's past OD work including the creation of national and international standards of practice. More Videos Feature Videos Learn about the Office of Safety and Mission Assurance, its disciplines and programs, and much more in these feature videos. Safety Messages Guest speakers deliver the monthly Safety Messages in these live recordings. Knowledge Bytes These short videos provide expert insight on various safety and mission assurance topics. Policy Bytes Policy owners explain recent changes to policies and standards in these short videos. Event Videos Video captures of live events on Safety and Mission Assurance topics.