Katie Colaneri reports on three undocumented immigrants arrested by federal immigration officials in Philadelphia. Joe Hernandez looks into a miscommunication by 911 dispatchers that may have caused a shootout between state troopers and a New Jersey homeowner. Phil Gregory reports on Governor Christie’s expansion of Medicaid. Theater blogger Howard Shapiro sits down with Sara Garonzik to talk about her legacy after she is honored with a lifetime achievement award. Aaron Moselle brings the story of Olympic hurdler and Germantown native Nia Ali. In this week’s edition of SkyTalk, host Dave Heller speaks with Derrick Pitts, chief astronomer at the Franklin Institute, about the speed of our solar system.