Astronauts on American Rockets, an update this week on planetary radio.

Welcome, I'm at Kaplan of the Planetary Society with more of the human adventure across our solar

system and beyond.

Boeing and SpaceX are working toward the climax of NASA's commercial crew program, the effort to once again regularly get humans

to low Earth orbit and the International Space Station and do so on U.S. rockets and in U.S. spaceships.

We'll talk to the agency's John Coward.

He's working toward this goal with Elon Musk Company.

The only human spaceship that has landed on another world will win someone this week's space trivia

contest prize package.

Bill Nye has the week off, but Planetary Society Senior Editor Emily Lochuala is here to present a visual knockout.

Emily, I am crazy about this May 17 piece.

Saturn, small satellites to scale.

It is one of your, as you refer to it patented images these collections of

bodies in our solar system you have gained well-deserved recognition for these

and and this is just as fascinating as any as I have seen.

What amazing diversity among these moons of Saturn?

They really are quite strange.

Each one you look at is a unique world unto itself and

looking at one sometimes it can kind of predict the appearance of the next size one

but often it doesn't. They're just so diverse. You've got a whole bunch of the small bodies here and

then you zoom in on some of the smallest of these. They're tiny, I mean not even a cubic

kilometer. They get quite small and of course as you might imagine the boundary between what is a moon and what is a ring

...