Join NPR's Joe Palca for a an update on several space missions exploring our solar system. We'll get the latest from Cassini in its orbit around Saturn, check in with the twin Mars rovers and bid "bon voyage" to Messenger, soon to lift off for Mercury.
Larry Esposito, principal investigator, Cassini Ultraviolet Imaging Spectrograph (UVIS). Professor at the University of Colorado. Planetary Astronomer, Laboratory for Atmospheric and Space Physics in Boulder, Colo.
Jim Bell, associate professor at Cornell University, Department of Astronomy.
Sean Solomon, principal investigator, Messenger. Director, Department of Terrestrial Magnetism. Carnegie Institution of Washington.