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The possibility of astrobiology for many decades.

And there's always new information coming in which makes planetary science endlessly interesting.

You have all this data that you know in a hundred years there's still going to be processing it.

But it's fresh when you see it.

And what's fresh right now is that Juno, which is the NASA probe of Jupiter, been in orbit,

has now given us pictures of Ganymy, a very large moon.

The distinguishing characteristic of these photographs is that it has cracks in the surface

that look like somebody's been skating over it.

Dr. Grinspoon, what do we make of these cracks?

Have we seen this before?

Well, we've seen it before, but this is a wonderful new close-up look.

I mean, our first decent views of Ganymy, they weren't quite this decent,

but the first time we really saw what the picture was like, goes back to the Voyager mission in 1979,

when Voyager did its flyby through the Jupiter system.

But then in the 90s, we had the Galileo probe, which was a Jupiter orbiter,

which made many passes by Ganymy and got us a lot of great images.

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