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Article: All Signs Point to Hidden Ocean on Saturn Moon Titan. Another Possible Candidate Planet for Alien Life?

Posted on: May 9, 2011

A huge ocean of liquid water may indeed slosh about beneath the frigid surface of Saturn’s moon Titan, according to new evidence collected by a NASA spacecraft.

The observations were made by NASA’s Cassini probe, which has been eyeing Saturn and its rings and moons from orbit since arriving at the gas giant in 2004.

Certain details of Titan’s orbit and rotation aren’t compatible with the behavior of a celestial body that is completely solid all the way through. But these details make a lot of sense if the huge moon is assumed to have a subsurface ocean, likely of liquid water, researchers said.

A huge ocean of liquid water may indeed slosh about beneath the frigid surface of Saturn’s moon Titan, according to new evidence collected by a NASA spacecraft.

The observations were made by NASA’s Cassini probe, which has been eyeing Saturn and its rings and moons from orbit since arriving at the gas giant in 2004.

Certain details of Titan’s orbit and rotation aren’t compatible with the behavior of a celestial body that is completely solid all the way through. But these details make a lot of sense if the huge moon is assumed to have a subsurface ocean, likely of liquid water, researchers said.

The new study is not the first to suggest Titan may have an underground ocean. But it adds another line of evidence in support of this supposition, which could make the intriguing moon a likelier candidate to support life as we know it.

“We think that the presence of an internal ocean is likely,” said study lead author Rose-Marie Baland of the Royal Observatory of Belgium in Brussels. [Photos: The Rings and Moons of Saturn]

A liquid ocean

So Baland and her colleagues crunched Cassini’s numbers in even greater detail. They found that Titan’s orbital behavior indeed makes sense if the moon is assumed to have a solid interior surrounded by a liquid-water ocean, which itself sits beneath an icy “shell.”

The sizes of these various layers are tough to pin down at the moment, but the researchers said their modeling work suggests the icy shell might be 93 to 124 miles (150 to 200 kilometers) thick and the ocean 3 to 264 miles (5 to 425 km) deep, with the solid interior making up the rest.

Titan is about 3,200 miles (5,150 km) in diameter.

Current thinking about Titan’s formation and evolution suggests that this ocean would be composed primarily of water — perhaps with a dash of ammonia — rather than hydrocarbons or some other substance, Baland said.

If this were the case, Titan would join several other frigid moons in the outer solar system — such as Saturn’s moon Enceladus and Jupiter’s Europa — in the water-ocean club.

Other lines of evidence point to this same conclusion. The entire surface of Titan, for example, appears to be sliding around, suggesting that the moon’s crust and core are separated by a layer of liquid water. Models of Titan’s internal heat flow support this idea as well.

Baland and her team will report their results in an upcoming issue of the journal Astronomy & Astrophysics.

A candidate for life?

Some astrobiologists speculate that some exotic type of methane-based life could be swimming about in Titan’s hydrocarbon lakes. [5 Bold Claims of Alien Life]

But the only life we are certain of is here on Earth. And on our planet, life is tightly tied to liquid water; pretty much anywhere the stuff is found, life takes root and sticks around. So the presence of liquid water on Titan would make that already intriguing world an even better candidate for life, researchers said.

“Astrobiologists do not not really know yet what are the necessary conditions for life to emerge, but it seems that the presence of water is a requirement,” Baland said.

The researchers hope the new study will inspire others to keep probing Titan’s depths until the question of Titan’s subsurface sea is settled once and for all.

“We hope that it will encourage other scientists to look for any other evidence for this ocean,” Baland said.

Read More…

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