U.S. Air Force Col. Greg H. Johnson speaks to St. Francis de Sales High School students about his flights aboard the Endeavor and International Space Station.
Blade/Lori King
Former astronaut and retired U.S. Air Force Col. Greg H. Johnson speaks to students at St. Francis de Sales High School about his time in space, and how the work of astronauts impacts life on earth. Scroll through the gallery to see all of the photos.