Gregory E. Chamitoff PhD ’92, who recently returned from a 179-day tour of duty aboard the International Space Station as the Flight Engineer and Science Officer for Expedition 17-18, which began June 2, 2008, stands with a miniature satellite that was developed at the MIT Space Systems Laboratory. While aboard the ISS, Chamitoff used these satellites to test hypersonic satellite motion planning algorithms he developed for his PhD thesis. Chamitoff gave a lecture on Tuesday at the Space Systems Laboratory.