This episode of Astronomy Cast is brought to you by Swinburne Astronomy Online, the world's longest running online astronomy degree program.

Visit astronomy.swin.edu.au for more information.

Astronomy Cast Episode 230 from Monday, April 25, 2011. Christian Hoygens.

Welcome to Astronomy Cast, our weekly facts-based journey through the cosmos to help you understand not only what we know, but how we know what we know.

My name is Fraser Cain, I'm the publisher of University Day, and with me is Dr. Pamela Gaia Professor at Southern Illinois University, Everett's Fill.

Pamela, how are you doing?

I'm doing well, how are you doing Fraser?

Doing really well. So this is the third live show that we've done, and by live I mean we're doing it as a Google Hangout.

So, you know, but once a week we all connect as a Hangout, and eight of our closest friends can watch as we record the show.

We typically answer some questions beforehand, and stick around, and answer questions afterwards.

So it's quite a lot of fun, and so if you're listening to this episode, and you want to get involved, probably the best way is to get a Google plus account, and then add me and or Pamela as friends.

If you don't have a G plus account, then I would suggest you email me, probably me not Pamela, Fraser Cain at gmail.com and say, give me a Google plus invite please.

I will send you the invite, and then also add you to the circle so that you can get notified when we do these live recordings.

And hopefully down the road, they'll add more people to the Hangout, so we'll have more people being able to listen.

And we are working on figuring out how to do things like share it through you stream via cam twist or something like that.

We're just not quite there yet, and nor is our bandwidth.

Yeah, well this was just so easy, so convenient.

We can kind of stick around and chat with people, so if people want us to do more of this, we'll figure out some long term solution.

I like the ones that don't require a lot of effort and expense, which is what this does.

Okay, all right, well, so now we finish our trilogy of Saturnian astronomers and missions with a look at the Dutch astronomer and mathematician Chris John Huygens.

It was Huygens who discovered Titan and figured out what Saturn's rings really are, so it makes sense that a probe landing on the surface of Titan was named after him.

All right, Pamela, so this was great. I mean, we did the first episode we did on Cassini, the guy who did some of the best observations of Saturn.

...