The Sound of H1, the time piece that shook the naval world 280 years ago.

We'll meet it 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. Come with me today to the Zero Meridian,

the line that begins and ends longitude on planet Earth and the quest for

longitude or an accurate way to determine it will be my topic with the curator

of the Royal Observatory Greenwich Dr Dr. Louise Devoy.

Bill Nye is on vacation this week.

Bruce Betts will join us later to solve a radioactive puzzle.

Here and now is Senior Editor Emily Lockwala, with yet more excitement delivered by the New Horizon

spacecraft.

Emily, how did you react to that image of really Pluto's atmosphere?

I literally gasped. I just couldn't believe what I was seeing I mean I don't I don't really know what I expected from the look back images

But I certainly didn't expect anything as dramatic as these layers of haze floating quite a long way away up above the surface of Pluto.

And I guess you weren't the only one who was surprised.

I think it's safe to say that everybody was surprised by these pictures.

I've heard of scientists crying. In in fact seeing this photo. It's

really quite amazing. Do we know what we're looking at here? What is that haze?

Well it's a haze is particles suspended in the atmosphere.

They're very, very good at scattering light

forward to the viewer if you have them backlit by the sun

and that's the lighting situation here.

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