The Really Big Picture: Things We Know about the Universe, and How We Know Them

The structure and nature of the universe has puzzled and fascinated people for thousands of years. Only recently, however, has it been possible to measure some of its fundamental properties. What do we know, how do we know it, and what might we learn in the near future?

About the Lecturer
Dr. Charles R. Lawrence, Principal Scientist, Astrophysics, Jet Propulsion Laboratory