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  • “Exploration is in our nature.” - Carl Sagan

Planetary Radio Episodes

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.

The Lick Observatory’s 1888 Great Refractor Telescope

Space Policy Edition: The Long Space Age with Alex MacDonald

Alex MacDonald, former Chief Economist at NASA and author of "The Long Space Age," joins Casey Dreier to explore more than two centuries of privately funded space exploration in America.

NASA's Vehicle Assembly Building at Sunrise

Space Policy Edition: NASA's Economic Impact with Alex MacDonald and Joshua Drucker

What is NASA’s return on investment? NASA chief economist Alex MacDonald and University of Illinois Chicago professor Joshua Drucker provide revealing answers from a new economic impact report.