Lecture 1: Dark Matter, The Problem

Just as particle physicists were converging on their powerful and apparently comprehensive understanding of matter, astronomers and cosmologists discovered that there’s much more. In fact, “normal” matter – the kind that goes into chemistry, biology, all forms of engineering and most of astrophysics – makes only ~ 4% of the universe by weight. I’ll discuss the evidence and describe the (few) known properties of "dark matter" and "dark energy"