From NASA/ESA/ISA Cassini Huygens via EarthSky: “Scientists find new surprises about Titan’s lakes”

NASA Cassini Spacecraft

From NASA/ESA/ISA Cassini-Huygens

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EarthSky

April 23, 2019
Paul Scott Anderson

Cassini data now reveal that some of Titan’s lakes are surprisingly deep.

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Infrared view of seas and lakes in Titan’s northern hemisphere, taken by Cassini in 2014. Sunlight can be seen glinting off the southern part of Titan’s largest sea, Kraken Mare. Image via NASA/JPL-Caltech/University of Arizona/University of Idaho.

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Kraken Mare, Titan’s largest sea, is the body in black and blue that sprawls from just below and to the right of the north pole down to the bottom.

Saturn’s largest moon Titan is the only world in our solar system besides Earth known to have bodies of liquid on its surface. Scientists announced definitive evidence for them in 2007, based on data from NASA’s Cassini spacecraft. The large ones are known as maria (seas) and the small ones as lacus (lakes). It’s now known that Titan’s hydrologic cycle is surprisingly similar to Earth’s, with one big exception: the liquid on Titan is liquid methane/ethane instead of water, due to the extreme cold. The moon’s northern hemisphere, in particular, has dozens of smaller lakes near its pole, and now scientists have found that they are surprisingly deep and sit on the tops of hills and mesas. These observations come from data collected during the last close flyby of Titan during the Cassini mission, which ended in 2017.

The new peer-reviewed findings were published on April 15, 2019, in the journal Nature Astronomy.

Scientists had thought that the lakes would be an almost equal mixture of methane and ethane, like the larger seas. This is the case with the one sizable lake in the southern hemisphere called Ontario Lacus.

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This RADAR-image of Ontario Lacus, the largest lake on the southern hemisphere of Saturn’s moon Titan, was obtained by NASA’s Cassini spacecraft on Jan. 12, 2010. North is up in this image.

But to their surprise, they found that the lakes in the northern hemisphere are composed almost entirely of methane. As lead author Marco Mastrogiuseppe, a Cassini radar scientist at Caltech, explained:

“Every time we make discoveries on Titan, Titan becomes more and more mysterious. But these new measurements help give an answer to a few key questions. We can actually now better understand the hydrology of Titan.”

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Map of Titan’s seas and lakes in the northern hemisphere. Image via JPL-Caltech/NASA/ASI/USGS.

But while some questions may be answered, other new ones are also raised. Why the difference between the lakes in the northern and southern hemispheres? Also, the hydrology on one side of the northern hemisphere appears to be very different from that on the other side. Why? On the eastern side, you find larger seas with low elevation, canyons and islands. But the western side is dominated by the smaller lakes perched on top of hills and mesas. Some of those lakes are more than 300 feet (100 meters) deep, a surprise given their small sizes. As noted by Cassini scientist and co-author Jonathan Lunine of Cornell University:

“It is as if you looked down on the Earth’s North Pole and could see that North America had completely different geologic setting for bodies of liquid than Asia does.”

The findings show how Titan’s alien yet earthly-ish landscape is even more unusual than first thought. They show very deep lakes sitting atop tall mesas or plateaus, suggesting that they formed when the surrounding bedrock of ice and solid organics chemically dissolved and collapsed. These Titan lakes are reminiscent of karst lakes on Earth, which form when subterranean caves collapse. In the earthly counterparts, however, water dissolves limestone, gypsum or dolomite rock.

This is a great example of how – much like the hydrologic cycle – geologic processes on Titan can also mimic those on Earth, yet be uniquely Titanian at the same time. In many ways, Titan looks a lot like Earth, but the underlying mechanisms, and composition of materials, are fundamentally different on this world in the much-colder outer solar system.

Cassini also observed another kind of lake on Titan. Radar and infrared data revealed transient lakes where the level of liquids varies significantly. These results have been published in a separate paper in Nature Astronomy. According to Shannon MacKenzie, a planetary scientist at the Johns Hopkins University Applied Physics Laboratory, those changes may be seasonal:

“One possibility is that these transient features could have been shallower bodies of liquid that over the course of the season evaporated and infiltrated into the subsurface.”

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Images from Cassini showing new small lakes appearing in Arrakis Planitia between 2004 and 2005. Such lakes seem to be transient, where the liquids fill the lakes before evaporating or seeping into the ground again. Image via NASA/JPL/Space Science Institute.

Taken together, the results about both the deep lakes and transient lakes support the scenario where methane/ethane rain feeds the lakes, which then evaporate back into the atmosphere or drain into the subsurface, leaving reservoirs of liquid below the surface. It is a complete hydrologic cycle, but, in the colder environment than on Earth, one where methane and ethane can be liquid and water is in the form of rock-hard ice.

The presence of lakes and seas on Titan brings up another question. Might there possibly be any form of life there? Some scientists think there indeed could be at least microscopic organisms, despite the harsh conditions in contrast to Earth, that use liquid methane/ethane in a similar way that life here uses water. Such life would have to be evolved to exist in conditions unlike any on Earth, but it’s an intriguing possibility.

Bottom line: Data on Titan’s lakes, collected by the Cassini spacecraft (whose mission ended in 2017), continue to reveal insights into a hydrologic cycle that’s remarkably similar to Earth’s in some ways – but distinctly alien in others. A new finding is that lakes near Titan’s north pole are surprisingly deep and sit on the tops of hills and mesas.

See the full article here .

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The Cassini-Huygens mission was a cooperative project of NASA, the European Space Agency and the Italian Space Agency. JPL, a division of the California Institute of Technology, Pasadena, managed the mission for NASA’s Science Mission Directorate in Washington. The VIMS team is based at the University of Arizona in Tucson. The radar instrument was built by JPL and the Italian Space Agency, working with team members from the US and several European countries.

Cassini launched in October 1997 with the European Space Agency’s Huygens probe. The probe was equipped with six instruments to study Titan, Saturn’s largest moon. It landed on Titan’s surface on Jan. 14, 2005, and returned spectacular results.

Meanwhile, Cassini’s 12 instruments returned a daily stream of data from Saturn’s system since arriving at Saturn in 2004.

Among the most important targets of the mission are the moons Titan and Enceladus, as well as some of Saturn’s other icy moons. Towards the end of the mission, Cassini made closer studies of the planet and its rings.

Cassini completed its initial four-year mission to explore the Saturn System in June 2008 and the first extended mission, called the Cassini Equinox Mission, in September 2010. Since then the healthy spacecraft was seeking to make exciting new discoveries in a second extended mission called the Cassini Solstice Mission.

The mission’s extension, which goes through September 2017, is named for the Saturnian summer solstice occurring in May 2017. The northern summer solstice marks the beginning of summer in the northern hemisphere and winter in the southern hemisphere. Since Cassini arrived at Saturn just after the planet’s northern winter solstice, the extension will allow for the first study of a complete seasonal period.

The mission ended on September 15, 2017, when Cassini’s trajectory took it into Saturn’s upper atmosphere and it burned up.

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