Harvard University Professor of Astronomy Robert Kirschner, head of the Optical and Infrared Division of the Harvard-Smithsonian Center for Astrophysics, delivered the keynote address, “Taking the Measure of the Universe: How Big? How Old? How Do We Know?” at the annual Undergraduate Research Summer Institute (URSI) Symposium in the Villard Room.  Student researchers spoke about their work, and poster sessions on the summer research were presented in the second floor gallery of the College Center.