Dr. Luisa Rebull returns to the show to describe new research with the Kepler space telescope. Her ingenious study takes advantage of Kepler's strengths, and has produced results that stump theorists. Dr. Rebull explains why this data has given her "a whole new appreciation for post office workers."

Dr. Sebastiano Padovan talks about the planet closest to the sun, Mercury. He compares the evolution of planets to movies, and says that understanding a planet's history from its current state is like trying to figure out the plot of an entire movie from a single snapshot. He also explains why Mercury is "a favorite" of scientists who do computational modeling.

Tim Thompson, former JPL scientist and member of the Mt. Wilson Institute Board of Trustees, talks about the Mt. Wilson Observatory. He explains why he doesn't operate the Mt. Wilson telescopes himself, and tells us why astronomers hate the twinkling of the stars. This episode was recorded on location, and Tim talks about the many public events offered at Mt. Wilson.

Dr. Ingrid Daubar returns to the show to tell us about the InSight mission to Mars. InSight carries a seismometer and a self-hammering heat probe, and will explore the interior of the planet. She tells us what it was like to be at InSight's launch, and explains how the mission's landing site was selected.

Dr. Shohini Ghose talks about quantum entanglement, which she describes as an "amazing, weird handshake across space and time." She tells us about quantum information science, which finds useful applications for the weird quantum qualities of particles.

Dr. Burçin Mutlu-Pakdil talks about her amazing discovery-- a galaxy with both an inner and outer ring. The existence of such a galaxy had not been predicted before she discovered it, and there's no theory yet that can explain how such an unusual object was created.

Dr. Michele Koppes returns to the show to talk about her experiences studying glaciers in the field. She describes what a glacier sounds like at night, and why a good glaciologist is generally handy with a soldering iron.

Dr. Rosalie McGurk talks about her quest to find pairs of black holes. She explains how she used several different telescopes to solve this problem, narrowing the list of potential candidates from hundreds of thousands to about twenty.

Dr. Tom Connor stops by the show to talk about massive galaxy clusters and the CLASH project. We talk about naturally occurring gravitational "telescopes" that allow us to see even farther into space, and Dr. Connor makes some fun analogies to cupcakes and crime bosses.

Dr. James Tuttle Keane discusses why Pluto probably has a huge underground ocean. To make this discovery, he used images of Pluto taken by the New Horizons spacecraft, computer simulations, and good old-fashioned pen and paper.