NASA CLASS U.S. Navy Capt. Heidemarie M. Stefanyshyn-Piper, who is a NASA astronaut, speaks to a 4th Grade class at Boeblingen Elementary/Middle School on Panzer Kaserne in Boblingen, Germany. Stefanyshyn-Piper showed photos from her two trips into space. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 383595-T-IBS21-731.jpg Photo Gallery