Join Donate

Planetary RadioAugust 16, 2017

Ed Stone and Forty Years of Voyager in Space

Download MP3

On This Episode
Ed Stone head shot
Ed Stone

Voyager Project Scientist and David Morrisoe Professor of Physics, California Institute of Technology

It is most space fans’ favorite planetary science mission, and with good reason. We visit with the man who has been in charge of Voyager mission science for more than four decades. You’ve got an extra week to enter the space trivia contest, part of this week’s What’s Up segment with Bruce Betts and Mat Kaplan.

Loki erupts on Io's limb


Loki erupts on Io's limb
This Voyager 1 image of Io shows the active volcanic plume of Loki on the limb. A heart-shaped feature southeast of Loki consists of fallout deposits from the active plume Pele. The images that make up this mosaic were taken from an average distance of approximately 490,000 kilometers.
Voyager 2 in the solar wind

NASA / GSFC Conceptual Image Lab

Voyager 2 in the solar wind
This artist's concept shows the venerable Voyager 2 spacecraft journeying out of the solar system at 15 kilometers per second (34,000 miles per hour) with the solar wind streaming past it four times faster.
Ed Stone

Smithsonian Institution

Ed Stone

Related Links:

Trivia Contest

This week's prizes are the brand new Chop Shop-designed Planetary Radio t-shirt and a 200-point astronomy account.

This week's question:

What is the funny word used when three celestial bodies are lined up, as in an eclipse? It’s not “stooges.”

To submit your answer:

Complete the contest entry form at or write to us at no later than Wednesday, August 30th at 8am Pacific Time. Note the special deadline! Be sure to include your name and mailing address.

Last week's question:

When is the next total solar eclipse on Earth after the one on August 21, 2017?


The answer will be revealed next week.

Question from the week before:

Just before totality in a solar eclipse, the sun is blocked except for sunlight streaming through lunar valleys along the limb. Who are these brief, bright “beads” of light named after?


“Baily’s Beads” are named for British astronomer Francis Baily who observed and explained them in 1836.

Listen more: Titan, the Sun, solar eclipse, Voyager 1 and 2, life in the universe, Saturn's moons, Jupiter's moons, Io, Europa, history, Neptune, Uranus, Jupiter

You are here:
Comments & Sharing
Bill Nye and people
Let's Change the World

Become a member of The Planetary Society and together we will create the future of space exploration.

Join Today

Mat Kaplan
Support Planetary Radio

Keep our weekly radio program broadcasting online and on the air around the world.