SAN FRANCISCO — A glint of light from a large lake confirms the presence of surface liquid in Titan’s northern hemisphere. This image, released Thursday here at the American Geophysical Union meeting, was captured on July 8, using the Cassini spacecraft’s visual and infrared mapping spectrometer.
“This one image communicates so much about Titan — thick atmosphere, surface lakes and an otherworldliness,” said Cassini project scientist Bob Pappalardo, of NASA’s Jet Propulsion Laboratory, in a press release. “It’s an unsettling combination of strangeness yet similarity to Earth.”
Titan, Saturn’s largest moon, has a dense nitrogenous atmosphere and is the only place, other than earth, containing stable pools of liquid on its surface. In 2008, Cassini confirmed liquid methane lakes in Titan’s southern hemisphere using infrared data.
Cassini has been looking for this mystical glint since reaching Saturn in 2004, but winter had shrouded the northern half of Titan. The sun began shining on this area, which contains more lakes than the southern hemisphere, in August 2009 during the moon’s spring equinox.
The glint comes from the southern shoreline of the sprawling Kraken Mare lake, which covers about 400,000 square kilometers of Titan’s surface. The image proves the lake has been stable for at least three years, indicating that Titan cycles liquid methane to its surface, said Ralf Jaumann, Cassini team member at the German Aerospace Center in Berlin, Germany.
“These results remind us how unique Titan is in the solar system,” Jaumann said in a press release. “But they also show us that liquid has a universal power to shape geological surfaces in the same way, no matter what the liquid is.”
Image: NASA/JPL/University of Arizona/DLR
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The historic image shows a telltale bright reflection

NASA have revealed that a flyby of its probe Cassini past Titan, a moon of Saturn, has produced a historic image: the first photograph showing liquid on a world other than our own.

The picture shows a "specular reflection" from an extremely smooth surface, in this case a liquid. Cassini has been trying to spot one since arriving in 2004, and in 2008 used infrared data to prove that there were liquid methane lakes down there. The northern hemisphere has only been visible since August 2009, as before then it was covered by winter weather. Most of Titan's lakes are in the north.

"This one image communicates so much about Titan — thick atmosphere, surface lakes and an otherworldliness. It’s an unsettling combination of strangeness yet similarity to Earth," said Bob Pappalardo, a Cassini scientist with NASA's Jet Propulsion Laboratory. Titan's atmosphere is, like Earth's, mainly nitrogen, but temperatures on the icy world are around -180°C. This reduces the prospect of life, although the presence of liquid does increase the likelihood.

The lake seen in the photograph is called Kraken Mare, and at 150,000 square miles (400,000 square kilometers), it isn't the largest basin on north Titan, but it is bigger than the Earth's biggest lake, the Caspian Sea.

Ralf Jaumann, another Cassini scientist, spoke of the team's hopes for the future. "Next, we want to find out more about Titan's liquid. Do we have some kind of weather there? Do we have changes with seasons? Does it rain? How does the liquid methane run across the surface?"

A team of scientists are due to propose to NASA that the agency drop a boat into a Titan lake, with Kraken Mare and the similarly sized Ligeia Mare being hot candidates. The Titan Mare Explorer (TiME) is projected to be relatively low-cost at US$400 million and would investigate the composition, density and shape of a Titan lake. If launched in 2016 it could arrive in 2023 and spend several years floating on the moon. However, several other projects are also keen to get themselves the next opportunity NASA is offering for the launch of a new project other than its own.