Five years and five planets this week on planetary Radio. Radio. Hi everyone, welcome to Public Radio's travel show that takes you to the final frontier,

and we've been doing just that for five years.

I'm Matt Kaplan.

We're just minutes away from announcing the winners of our fifth anniversary contest,

including the lucky listener who will own a little chunk of Mars.

First, though, we'll talk again with Jeff Marcy, leader of the team that has just found a fifth planet,

circling a star barely 40 light years away. It's the biggest

planetary system yet discovered other than our own of course. Emily Lachihuahua is

seeing red and wondering why and along with helping me announce our big winners

Bruce Betts will be here to tell us about the night sky

Everyone seems to be taking snapshots of our blue marble of a planet.

Now it's Rosetta, the European probe that is headed for a comet.

The spacecraft swung by Earth a couple of weeks ago.

You can see the pretty pictures at planetary.org.

Speaking of pretty pictures, check out stars above Earth below, Tyler Nordgren's visual

journey of astronomy and space exploration in America's national parks, also at planetary.org.

It's off to Jupiter now with Emily. I'll be right back with astronomer and exoplanet discoverer Jeff Marcy. Hi, I'm Emily Lochuwala with questions and answers. A listener asked,

What makes Jupiter's great red spot red?

Despite the fact that astronomers have seen a red spot on Jupiter for almost 400 years.

We don't yet know what's responsible for its color.

The Great Red Spot is an antipyclonic storm rotating counterclockwise in the southern hemisphere.

Infrared measurements tell us that its clouds are rotating counterclockwise in the southern hemisphere.

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