Powerpoint Presentation Judith Bruner giving a speech Presenter giving a speech James Garvin, NASA GSFC's Chief Scientist, giving a speech Cindy Mead giving a speech Room full of people watching a presentation Presentation on Satellite Orbits Presenter giving a speech Presenter presenting Jonathan Rot and Louis Thomas Hal Bell giving a presentation Presenter giving a speech Christopher J. Scolese giving a speech Room of people watching a presentation Full auditorium watching a presentation