Radio Smart Talk for Wednesday, January 19: Astrophysicist Neil deGrasse Tyson will be our guest. He'll take calls about anything having to do with the universe, from recent planetary discoveries to other universal curiosities, like black holes, microquasars, and dark matter – anything you might like to know about the universe. He'll also preview a new season of NOVA ScienceNOW, which premieres tonight at 8 on WITF-TV!