Other universes, other dimensions, this week on planetary radio. Radio. Hi everyone, I'm Matt Kaplan.

Welcome to Public Radio's Travel Show that takes you to the final frontier.

And we've never meant that more than we do today.

Our guest is renowned Harvard physicist Lisa Randall.

We'll talk about how she has pushed back the boundaries of the Cosmos and about her great new

book, Warped Passages, Unravelling the Mysteries of the Universe's Hidden Dimensions.

We might uncover some mysterious yet entertaining new dimensions of Bruce Betts in this week's edition of What's Up?

And Emily is back with a new Q&A segment.

So much news from around the solar system, so little time. We could talk about the Japanese

Space Agency re-establishing contact with its Hiabusa asteroid probe after three months of silence. We could celebrate the possible

discovery of liquid water geysers on Ancellidus, the tiny moon of Saturn. But

then there's the big story taking place in the Martian sky.

All stations, this is NAFMSA, we have one way.

That's how the tension broke at the jet propulsion laboratory, just as the Mars Reconnaissance

Orbiter swung around the red planet, re-establishing contact with its nervous controllers.

We have two-way duffler and MRO is in orbit around the planet Mars. MRO was indeed right on the money settling into an orbit that will soon allow it to examine all of Mars in far

greater detail than has ever been available. All these stories and more are at

planetary.org. Indeed Emily has returned.

This week she takes us back to the ocean under the ice on Jupiter's moon,

Europa.

If you ask me, that primordial soup needs a little salt.

I'll be right back with Lisa Randall. Hi, I'm Emily Loch Duwala with questions and answers. A listener asked, how do we know that the

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