NASA spacecraft that were launched decades ago are finally exiting our solar system. What will we discover as they cross the fuzzy boundary of our solar system? Also, it’s spring time! The spring equinox is around the corner, which means there will be equal hours of daylight and darkness. Derrick Pitts, Chief Astronomer at the Franklin Institute, tells us what to expect from the night sky.[audio:st20090316.mp3]Get the mp3 »Visit the Skytalk web page for more information.