For centuries, people have wondered whether other stars have planets, and whether those planets might harbor life. Within the last few decades, it has become possible to make progress on these timeless questions. Exoplanetary science --- the study of planets around other stars --- is one of the newest and most rapidly growing branches of astrophysics. Princeton is home to a vibrant research program in this field, including theoreticians, observers, and instrument builders for ground and space-based observatories. In addition to the faculty named below, there are currently about 7 graduate students and 8 postdoctoral scientists who work on planetary astrophysics, at Peyton Hall and the Institute for Advanced Study. Gaspar Bakos's group builds innovative instruments for detecting exoplanets and, more broadly, exploring the domain of bright and time-variable astrophysical phenomena. They run the ongoing HATNet and HATSouth surveys, which search for transiting planets using a network of custom-built small telescopes around the world. They have discovered nearly 100 planets, including some of the most exotic and intensively studied planets. His most recent initiative is HATPI, which will continuously image one-quarter of the celestial sphere (corresponding to a solid angle of pi radians).