Explore the latest findings on exoplanets within 0.25 AU of their stars in this AGU Fall Meeting 2011 Sagan Lecture. Delve into the radii, masses, densities, and occurrence rates of these close-orbiting planets as presented by Geoffrey W. Marcy from the University of California, Berkeley. Gain insights into the cutting-edge research shaping our understanding of planetary systems beyond our own in this 53-minute talk delivered at Moscone South, Room 103.