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Titan forecast: partly cloudy with an opportunity of methane showers

May 15, 2025
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Titan forecast: partly cloudy with an opportunity of methane showers
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A science group has mixed information from the NASA/ESA/CSA James Webb Area Telescope and the Keck II telescope to see proof of cloud convection on Saturn’s moon Titan within the northern hemisphere for the primary time. Most of Titan’s lakes and seas are situated in that hemisphere, and are probably replenished by an occasional rain of methane and ethane. Webb additionally has detected a key carbon-containing molecule that provides perception into the chemical processes in Titan’s advanced ambiance.

Titan (Webb picture – 11 July 2023)

Saturn’s moon Titan is an intriguing world cloaked in a yellowish, smoggy haze. Just like Earth, the ambiance is generally nitrogen and has climate, together with clouds and rain. Not like Earth, whose climate is pushed by evaporating and condensing water, frigid Titan has a methane (CH4) cycle. It evaporates from the floor and rises into the ambiance, the place it condenses to type methane clouds. Sometimes it falls as a cold, oily rain onto a strong floor the place water ice is difficult as rocks. 

“Titan is the one different place in our Photo voltaic System that has climate like Earth, within the sense that it has clouds and rainfall onto a floor,” defined lead writer Conor Nixon of NASA’s Goddard Area Flight Middle in Greenbelt, Maryland.

The group noticed Titan in November 2022 and July 2023 utilizing each Webb and one of many twin ground-based W.M. Keck telescopes. These observations not solely confirmed clouds within the mid and excessive northern latitudes on Titan – the hemisphere the place it’s at present summer time – but additionally confirmed these clouds apparently rising to increased altitudes over time. Whereas earlier research have noticed cloud convection at southern latitudes, that is the primary time proof for such convection has been seen within the north. That is vital as a result of most of Titan’s lakes and seas are situated in its northern hemisphere and evaporation from lakes is a significant potential methane supply. 

On Earth the bottom layer of the ambiance, or troposphere, extends as much as an altitude of about 12 kilometers. Nonetheless, on Titan, whose decrease gravity permits the atmospheric layers to broaden, the troposphere extends as much as about 45 kilometers. Webb and Keck used totally different infrared filters to probe to totally different depths in Titan’s ambiance, permitting astronomers to estimate the altitudes of the clouds. The science group noticed clouds that appeared to maneuver to increased altitudes over a interval of days, though they weren’t in a position to immediately see any precipitation occurring.

“Webb’s observations have been taken on the finish of Titan’s northern summer time, which is a season that we have been unable to look at with the Cassini-Huygens mission,” stated Thomas Cornet of the European Area Company, a co-author of the examine. “Along with ground-based observations, Webb is giving us treasured new insights into Titan’s ambiance, that we hope to have the ability to examine a lot closer-up sooner or later with a attainable ESA mission to go to the Saturn system.”

Titan (Webb and Keck picture – 11 and 14 July 2023)

Titan’s chemistry

Titan is an object of excessive astrobiological curiosity because of its advanced natural (carbon-containing) chemistry, regardless of its frigid temperature of about -180 levels Celsius. Natural molecules type the idea of all life on Earth, and learning them on a world like Titan might assist scientists perceive the processes that led to the origin of life on Earth.

The essential ingredient that drives a lot of Titan’s chemistry is methane. Methane in Titan’s ambiance will get break up aside by daylight or energetic electrons from Saturn’s magnetosphere, after which recombines with different molecules to make substances like ethane (C2H6) together with extra advanced carbon-bearing molecules.

Webb’s information offered a key lacking piece for our understanding of the chemical processes: a definitive detection of the methyl radical CH3. This molecule (known as ‘radical’ as a result of it has a ‘free’ electron that isn’t in a chemical bond) types when methane is damaged aside. Detecting this substance signifies that scientists can see chemistry in motion on Titan for the primary time, fairly than simply the beginning components and the top merchandise.

“For the primary time we will see the chemical cake whereas it’s rising within the oven, as an alternative of simply the beginning components of flour and sugar, after which the ultimate, iced cake,” stated co-author Stefanie Milam of the Goddard Area Flight Middle.

The way forward for Titan’s ambiance

This hydrocarbon chemistry has long-term implications for the way forward for Titan. When methane is damaged aside within the higher ambiance, a few of it recombines to make different molecules that ultimately find yourself on Titan’s floor in a single chemical type or one other, whereas some hydrogen escapes from the ambiance. In consequence, methane will probably be depleted over time, except there’s some supply to replenish it.

The same course of occurred on Mars, the place water molecules have been damaged up and the ensuing hydrogen misplaced to area. The outcome was the dry, desert planet we see right now.

“On Titan, methane is a consumable. It’s attainable that it’s being continuously resupplied and fizzing out of the crust and inside over billions of years. If not, ultimately it’s going to all be gone and Titan will grow to be a principally airless world of mud and dunes,” stated Conor.

This information was taken as a part of Heidi Hammel’s Guaranteed Time Observations program to review the Photo voltaic System. The outcomes have been published within the journal Nature Astronomy.

 

Extra info
Webb is the most important, strongest telescope ever launched into area. Below a world collaboration settlement, ESA offered the telescope’s launch service, utilizing the Ariane 5 launch automobile. Working with companions, ESA was answerable for the event and qualification of Ariane 5 variations for the Webb mission and for the procurement of the launch service by Arianespace. ESA additionally offered the workhorse spectrograph NIRSpec and 50% of the mid-infrared instrument MIRI, which was designed and constructed by a consortium of nationally funded European Institutes (The MIRI European Consortium) in partnership with JPL and the College of Arizona.

Webb is a world partnership between NASA, ESA and the Canadian Area Company (CSA).

Release on esawebb.org

Contact:
ESA Media relations
media@esa.int

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