Planetary Radio • Jul 21, 2015

Planetary Radio Live at the New Horizons Pluto Encounter

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On This Episode

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Bruce Betts

Chief Scientist / LightSail Program Manager for The Planetary Society

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Jim Bell

Past President (2008-2020), Board of Directors of The Planetary Society; Professor, School of Earth and Space Exploration, Arizona State University; Principal Investigator, NASA Perseverance rover Mastcam-Z instruments

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Mike Brown

Planetary Astronomer for California Institute of Technology

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Bill Nye

Chief Executive Officer for The Planetary Society

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Linda Spilker

Voyager Mission Project Scientist at NASA's Jet Propulsion Laboratory

Join our live audience for highlights of an amazing evening, featuring Jim Bell, Bruce Betts, Mike Brown, Emily Lakdawalla, Linda Spilker, and Bill Nye the Science Guy. Emily returns to provide the latest news from New Horizons as it voyages beyond Pluto. We close, as usual, with What’s Up and a new space trivia contest.

Mat Kaplan and guests wait for New Horizons to phone home from Pluto
Mat Kaplan and guests wait for New Horizons to phone home from Pluto Image: Southern California Public Radio

Related Links:

This week's prizes are a fabulous Planetary Radio t-shirt and a 200-point account for remote use of their worldwide network of telescopes.

This week's question:

As of July 14th, what was the unofficial name given by the New Horizons team to the dark feature that some have also unofficially called “The Whale?”

To submit your answer:

Complete the contest entry form at or write to us at [email protected] no later than Tuesday, July 28th at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

What was the mass of the plutonium flown on New Horizons?


The answer will be revealed next week.

Question from the week before:

Of the five moons of Pluto known before New Horizons, which two moons have a mythological family relationship?


Pluto last passed outside the orbit of Neptune in 1999.