Seti at home turns 5 and 5 million this week on planetary radio. Radio.

Hello again and welcome back to the Planetary Society's weekly radio call to the Cosmos. I'm Matt Kaplan.

And a special welcome to any alien civilizations catching our show

as part of their own search for extra beetle juzian intelligence.

David Anderson directs the SETI at home project.

He'll give us a progress report as the world's largest computing effort hits its fifth

birthday. Bruce Betts has even more Comet Tales on What's Up,

along with a Name Those Comets contest.

And we'll start our journey as usual

with Emily Loch Duvalas Q&A.

I'll be right back with David Anderson.

Hi, I'm Emily Lockdawala with questions and answers.

A listener asked, is there lightning on other planets?

Yes, there is. Spacecraft images have shown us the ammonia clouds of Jupiter

lit up by extremely bright lightning flashes. Analysis of these images indicates that the

lightning is not actually happening inside the ammonia clouds, but instead in water clouds

deeper in Jupiter's atmosphere. The detection of bursts of radio waves has provided a second line of evidence proving the existence of powerful lightning flashes at Jupiter.

The lightning there is common and intense with about 10,000 flashes happening every second.

The same kinds of radio pulses that have been observed at Jupiter were also found at Saturn

by the Voyager spacecraft.

But the Voyager's equipment wasn't designed to study lightning,

so it wasn't even possible to determine whether the lightning was occurring in Saturn's

...