StarTalk Radio With Neil deGrasse Tyson --All-Star Team Ponders the Supermassive Black Hole at the Center of Our Milky Way Galaxy

Astrophysicist Janna Levin is back as host of StarTalk All-Stars, hunting for black holes with her guest, Shep Doeleman, the MIT astrophysicist leading the Event Horizon Telescope project to study black hole Sgr A* at the center of our galaxy....