repairing the Hubble Space Telescope in IMAX 3D this week on planetary radio. I'm Hi everyone, welcome to Public Radio's travel show that takes you to the final frontier.

I'm Matt Kaplan of the Planetary Society. It may already be in a theater near you.

Hubble 3D is the awe-inspiring film about the last repair mission to the Hubble.

We're minutes away from a conversation with the commander of that

mission and the producer, director of the film. We're even closer to our weekly report from

Emily Lochuwala, which means Bill Nye, the Science and Planetary Guy, is not far behind.

And Bruce Betts will help me tell you how you can enter to win an anniversary edition

First Scope from Celestial during this week's What's Up segment.

Here's something else to look forward to. What are you doing on the evening of Friday,

April 30th? If you'll be in Southern California, why not join us for Planrad Live?

The first recording of this show in front of a live audience.

Bill and the rest of the gang will be there along with our special guests, SpaceX's

builder of rockets Jeff Rakecky and

NASA pioneer James Burke. And it's free. That's April 30th. More details next

week. Time now to check in with the Keeper of the Planetary Society blog.

Emily, you took us back to Saturn last week.

I had some pretty pictures that you posted on the 19th, but really more significantly,

what's this about learning about the interior structure of

Titan how are we doing that and and why have you called it calisto with weather?

Well it's a tough thing to learn about the interior structures of any other bodies in the solar

system besides Earth where we have seismometers that tell us a lot about the

interior structure. The only way to learn about the insides of moons and planets

...