A 4 billion year old piece of Mars in my hand 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. We'll travel to a lab that has learned about the ancient climate of

Mars from a piece of the red planet that made its way to Earth 13,000 years ago, but this was also the week

NASA got good budget news, something Bill Nye will tell us about, and Emily Lachowala is

ready with the best ever images of a dwarf planet in the asteroid belt.

Emily Dawn, sneaking up on series right now, are we learning that this dwarf planet has a twin elsewhere in the solar system?

Well I think it remains to be seen how close the twin-dom appears once we get a little closer to

series and can see it in more detail. But it was really striking last week when these new images of

series came down and series that's looking a little bumpy, a little cratered, but

it's got this bright dot that has been visible in the Hubble images and just keeps on being more visible in the

dawn images.

And then a good friend of mine, Ted Stryke, who does a lot of work with vintage data, pointed

out how similar it looks to Umbriel, one of Uranus's moons.

This white spot, which is quite striking, I mean it's no artifact, you can see it rotating.

Anybody have any guess at what it might be.

It's definitely there. It's definitely rotating with the moon, it's definitely brighter than the

rest of series, but you have to be really careful about calling it white.

It's simply the brightest thing in the image and series itself is relatively dark.

It's got an albedo of around 10, 11, 12 percent which makes it brighter than comets but still kind of on the

darkish side more like the moon. and so it could be a fresh impact

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