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Saturday, October 6th, 2012

Time Event
3:55p
Saturn's Coolest #1: Titan
Before I tell you about Titan I should set the stage a little.

Voyager 2, as you probably know, went past Jupiter, Saturn, Uranus, and Neptune. All four - because they were lined up, and it was possible to fly past all of them - and this happens only once every couple hundred years; won't happen again in any of our lifetimes. We had this one shot. And we sent the two Voyager probes, both capable of making this grand tour.

But only one did. Why? Because we altered the trajectory of the other one - Voyager 1 - to fly close to Titan. That meant it had to give up Uranus and Neptune - both gas giant systems, all their moons and rings and mysteries, neither of which we'll visit again. Voyager 1 gave up all that, leaving them to its sister alone, just so its path through the Saturn system would take it close to Titan.

And twenty years later, when we launched Cassini towards the Saturn system, Cassini - unlike Galileo, which went to orbit Jupiter - carried a lander with it: the Huygens probe. The first thing Cassini did when it reached Saturn was drop the probe... so the probe could land on Titan, take pictures as it descended, and survive for a couple of minutes on the surface. We didn't bother to send a lander to any of Jupiter's moons. Titan's only the fifth thing we've landed anything on at all, after the Moon, Mars, Venus, and one near-Earth asteroid.

What makes Titan so special? Read more...Collapse )

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