For space nerds, this, from PRX. Astronomer Michelle Thaller examines the mysteries of the final frontier in snappy, monthly, 15-minute episodes. So far, she has enlisted the help of fellow scientist Phil Plait to consider the likelihood of alien life, Prof. Lisa Randall to explain the extinction of the dinosaurs, and Dr. Anna Moore to riff on observing space from Antarctica. Thaller's enthusiasm for her work is infectious and her guests articulate. We came away with genuine learnings, not to mention a crushing awe for the cosmic soup in which we swim.
Gateway episodes: Episode 1: Must Be Aliens (12 Dec 2015) / Episode 2: Mass Extinctions Get Personal (16 Jan 2016)