Planetary Radio • Aug 16, 2017

Ed Stone and Forty Years of Voyager in Space

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20170816 Ed Stone thumbnail

Ed Stone

Voyager Project Scientist and David Morrisoe Professor of Physics for 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.Image: NASA / JPL
Voyager 2 in the solar wind
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.Image: NASA / GSFC Conceptual Image Lab
Ed Stone
Ed Stone Image: Smithsonian Institution

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 [email protected] 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.