Planetary Radio • Feb 23, 2016

Exploring Saturn With Cassini

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On This Episode

20170920 linda spilker thumbnail

Linda Spilker

Voyager Mission Project Scientist at NASA's Jet Propulsion Laboratory

Cassini Mission Project Scientist Linda Spilker returns with the latest discoveries at the beautiful ringed planet, its moons and its rings. Emily Lakdawalla has assembled a crazy animation of distant Earth from a long dormant but just reawakened space camera. Bill Nye the Science Guy provides ample evidence that space has become a marketplace. A family of accomplished astronomers provides the answer to this week’s space trivia contest in our What’s Up segment, along with a new opportunity to win OK Go swag.

Saturn from Cassini
Saturn from Cassini Saturn from Cassini in 2004Image: NASA / JPL-Caltech / SSI / Processed and assembled by Kevin M. Gill
Red arcs on Tethys
Red arcs on Tethys Mysterious red streaks on Saturn’s moon Tethys imaged by the Cassini spacecraft.Image: NASA / JPL-Caltech / SSI

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This week's prize is an OK Go t-shirt signed by band members Damian Kulash and Tim Nordwind, along with a Planetary Radio t-shirt signed by...?.

This week's question:

In millions of kilometers, how far from the Sun is Mercury at its closest and farthest points in its orbit?

To submit your answer:

Complete the contest entry form at or write to us at [email protected] no later than Tuesday, March 1st at 8am Pacific Time. Be sure to include your name and mailing address.

Last week's question:

What is the peak wavelength of the Sun’s electromagnetic radiation to the nearest 100 nanometers?


The answer will be revealed next week.

Question from the week before:

What was famous astronomer Herschel’s first and middle names?


We’d have accepted Friedrich Wilhelm, Frederick William, Caroline Lucretia, or John Frederick William Herschel!