dj writes "NASA has designed a mission to map the boundary of the solar system. The mission is called IBEX (Interstellar Boundary Explorer) and it is ready to launch. The data collected by IBEX will allow scientists to understand the interaction between our Sun and the galaxy for the first time. Understanding this interaction will help us protect future astronauts from the danger of galactic cosmic rays." The IBEX Launch Blog will go active "about 2 hours before launch scheduled for 1:48 p.m. EDT," and the Southwest Research Institute will be running webcasts of the event. The IBEX fact sheet provides more details about the mission (PDF). IBEX will reach space via a Pegasus rocket launched from an L-1011 "Stargazer" carrier plane. You can see the launch countdown schedule at NASA's site.