A cloud in the Titanic sky

A cloud in the sky over Titan, possibly marking the beginning of the summer storms on Saturn's biggest moon. [Credit: NASA/JPL-Caltech/Space Science Institute]

A cloud in the sky over Titan, possibly marking the beginning of the summer storms on Saturn’s biggest moon. [Credit: NASA/JPL-Caltech/Space Science Institute]

Titan’s seasons change slowly: each year lasts 29.5 Earth years, so each season is more than 7 Earth years long. The moon is tidally-locked, presenting the same face to Saturn all the time, just like Earth’s Moon does, and it orbits very close to Saturn’s equator. That ties its seasons to Saturn’s: when the planet is in summer, so is Titan.

So summer has arrived in Titan’s northern hemisphere, but its weather is not changing quite as expected. For one thing, the moon has been nearly cloudless for years, when (according to computer simulations) the summer storms should have begun. That’s why the formation of a cloud bank over the methane lake Ligeia Mare is exciting, as I explained for The Daily Beast.

Cloud watching is important. Clouds carry material—water on Earth, methane on Titan—from one part of the atmosphere to another. They’re a way a world carries liquid from one region to another, in the form of evaporation and rain. A lake may dry up in one region, but a new one can form when rains fill a basin elsewhere. We know very well how that process works on Earth, but Titan’s weather is still mysterious in many ways.

But that’s one part of the mission of the Cassini probe orbiting Saturn. [read more…]

The Cassini team also put together a short video loop, showing the cloud bank forming, moving, and dissipating.

Animation of clouds on Titan. [Credit: NASA/JPL-Caltech/Space Science Institute]

Animation of clouds on Titan. [Credit: NASA/JPL-Caltech/Space Science Institute]

1 Response to “A cloud in the Titanic sky”


  1. 1 nowcontreras August 17, 2014 at 16:59

    Reblogged this on verdadesinfogramaticales and commented:
    The moon is tidally-locked


Comments are currently closed.



Please Donate

DrMRFrancis on Twitter

  • RT @SciencePunk: 75 years ago, the atomic bomb fell on Hiroshima. But the immeasurable suffering began years earlier in the Congo, where th… 9 minutes ago
  • both cats, naturally, think this is great and are demanding I pet them simultaneously 30 minutes ago
  • I have trouble sleeping in normal times, but I can't even tell you when I last got a decent night of sleep. It's been months. 45 minutes ago
  • no, I don't *want* to be awake before 4 AM, what did you think? 54 minutes ago
  • @tinyintern Yeah, risking alienating his Black supporters (who got him the nomination) to try to gain a few moderat… twitter.com/i/web/status/1… 7 hours ago

%d bloggers like this: