Since 2002, Planetary Radio has visited with a scientist, engineer, project manager, advocate, or writer who provides a unique perspective on the quest for knowledge about our Solar System and beyond. The full show archive is available for free.

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An astrogeologic experience with Kirby Runyon

Mat Kaplan, Planetary Radio's creator and former host, takes us on an adventure with planetary geologist Kirby Runyon as they tour New Mexico, U.S.'s varied geology and compare it to other worlds.

Neptune Odyssey: why we need to visit an ice giant

Leaders of the Neptune Odyssey study for the next planetary science and astrobiology decadal survey share their team’s exciting approach for an ice giant-orbiting spacecraft.

Hope for Pluto—Should We Re-Redefine Planets?

Planetary geologist Kirby Runyon is lead author of an abstract that proposes a new, geophysical definition of what a planet is.