The Great Pioneer Anomaly solved this week on planetary radio. Welcome to the Travel Show that takes you to the Final Frontier.

I'm at Kaplan of the Planetary Society.

Now we know what was ever so slightly pushing the pioneer spacecraft

off the courses that Isaac Newton said they should be on.

It wasn't some new twist on physics, but JPL scientists

Slavatura Shea will tell us how the answer will be useful to many current

and future missions of exploration. Bill Nye, the Science and Planetary Guy, is just back from the annual

National Space Symposium where he hobnobbed with his fellow Space Wizards.

We'll get a report from him in a minute and Bruce Betts will help me give away another Skype buddy video chat pack to someone who enters this week's space trivia contest.

Here's Emily Lockwala to get us started and she arrives with her new guide to craters on asteroid

Vesta, currently being studied by the Dawn spacecraft.

Emily, I love your cheat sheet and I would just bet you that there are people at the

Dawn Project office who are enjoying this as well.

Well probably they are although I think that the people on the Dawn Project have a

much more intimate relationship with these craters on Vesta than I have.

I made this cheat sheet of images of some of Vesta's more interesting craters and they are

very interesting.

They're unusual.

Some of them have black streaks, some of them have black streaks, some of them have

white streaks, some of them have both, some of them have sharp edges, some of them have dull edges, and some

of them have both, you know, that it's really quite an amazing varied surface. And they all do have names and I kept on looking at

this one particular black and white streaked one and thinking God I really ought to

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