Microgravity science involves the study of physical phenomena in which the normal force of gravity present on earth is greatly reduced. This is done by the use of parabolic-trajectory aircraft, drop towers, sounding rockets, and by conducting experiments in space. Microgravity research involves a broad range of disciplines, including materials, fluid dynamics, combustion, and biological systems. Microgravity research activities and interests in the Department of Aeronautics and Astronautics are focused on fluid physics and combustion. These include the study of film evaporation under normal- and reduced-gravity conditions and the effects of buoyancy in strongly-pulsed, turbulent jet flames.