Rosetta swoops past a big rock on its way to a comet this week on planetary Radio. Radio. Welcome to Public Radio's travel show that takes you to the Final Frontier.

I'm Ad Kaplan of the Planetary Society. Of all the asteroids and comets we visited,

Lutisha is by far the biggest. We'll talk with the European Space Agency's

Andrea Acomatso about the July 10 flyby that resulted in spectacular images of this

object.

Bill Nye, the science and planetary guy, drops by with some thoughts about Hayabusa's apparent capture of some tiny bits of another

asteroid and there will be soccer balls and hamburgers in space during this week's

What's Up segment.

Bruce Betts and I also have another special prize

for the winner of our latest space trivia contest.

We'll get underway by visiting once again

with Emily Loch du Wala,

science and technology coordinator for the Planetary Society and the editor

of its blog.

Emily, as you know, we're about to have a more in-depth conversation about Rosetta, but

I thought you might want to mention a terrific piece of work that you put up on the blog last week.

Well, thanks. I'm glad you liked it, Matt. I put together a montage of all of the best photos I could find of all of the asteroids and

comets that have been visited by spacecraft. There's four comets and nine

asteroid systems including ten separate bodies because of course when Galileo flew

by Ida it found that Ida had a

moon called Dactyl so there's two bodies in that one system and I just thought it was

kind of interesting to compare the sizes of all these different things that can be

...