On the Cover: Generations of stars glow in this infrared stellar "family tree" image taken by the Spitzer Space Telescope. This wispy, star-forming region, called W5, is about 6,500 light-years away in the constellation Cassiopeia. Here, the oldest stars are the blue dots in the hollow cavities (other blue dots are background and foreground stars not associated with the region). Younger stars line the cavity rims and show as pink at the ends of the pillars at upper right. White indicates star-forming areas, red shows heated dust that pervades the cavities, and green highlights dense clouds. For an expanded view of this image, visit http://www.spitzer.caltech.edu/Media/releases/ssc2008-15/ssc2008-15a.shtml. NASA/JPL-Caltech/L. Allen & X. Koenig (Harvard-Smithsonian Center for Astrophysics)
4 The Planetary Society's All-Sky Optical SETI: Where Are We Now? Paul Horowitz and His Research Group (Harvard University Optical SETI) give an update on this exciting Society project.