Image: Dark pools on Titan

January 11, 2016
Credit: NASA/JPL/USGS

This radar image from the Cassini orbiter shows a thin strip of surface on Saturn's moon Titan. The yellow-hued terrain appears to be peppered with blue-tinted lakes and seas. However, these would not be much fun to splash around in – rather than containing water, they are filled with liquid methane.

Cassini has been orbiting Saturn since 2004, and has studied Titan in detail. Alongside the Cassini orbiter was the Huygens probe, which separated from the orbiter on 25 December 2004 and landed on Titan 11 years ago this week, on 14 January 2005. This was the first landing on an outer Solar System body.

As intended, Huygens sent back data for a short time after landing – about 72 minutes – before its mission ended. The probe provided a unique insight into the moon's dense nitrogen-rich atmosphere during the descent, and gathered in situ measurements of the .

One of its discoveries was that the landing site resembled a dried lakebed, and there were channels and valleys nearby, hinting at the sporadic presence of surface liquid. A year later the presence of liquid-filled lakes was confirmed, making Titan the only Solar System body other than Earth known to have liquid lakes and seas on its surface.

This image is made from observations gathered during a flyby of Titan on 22 July 2006, when the orbiter was about 950 km from the moon's surface. It has been coloured to give a rough approximation of what Cassini saw – it does not reflect what the human eye would see.

Brighter regions that strongly reflected Cassini's radar signal look different from regions that reflected the signal weakly: bright areas show up as a tan–yellow shade, while less reflective regions appear as dark, mottled patches. These patches have also been tinted blue to make them even clearer; this is a research technique used by scientists to enhance and highlight various features and details in their observations.

Although Huygens' mission is over, we have many more opportunities to explore Titan with Cassini. The orbiter will perform nearly 40 more flybys of Titan before the mission ends in September 2017. These will range from close flybys at just under 1000 km, like the one responsible for this image, to more distant ones when the moon will be seen from a vantage point up to a million kilometres away.

Explore further: Huygens mission: Ten years at Titan

Related Stories

Huygens mission: Ten years at Titan

January 14, 2015

Celebrating the 10th anniversary of the pioneering Huygens mission to Saturn's moon Titan, the first successful landing on an outer Solar System world.

Cassini sees sunny seas on Titan

October 30, 2014

(Phys.org) —As it soared past Saturn's large moon Titan recently, NASA's Cassini spacecraft caught a glimpse of bright sunlight reflecting off hydrocarbon seas.

Peering through Titan's haze

December 8, 2015

This composite image shows an infrared view of Saturn's moon Titan from NASA's Cassini spacecraft, acquired during the mission's "T-114" flyby on Nov. 13, 2015.

Cassini captures familiar forms on Titan's dunes

April 8, 2014

(Phys.org) —The moons of our Solar System are brimming with unusual landscapes. However, sometimes they look a little more familiar, as in this new radar image from the Cassini orbiter. The image shows dark streaks carved ...

Cassini spots mini Nile River on Saturn moon Titan

December 12, 2012

(Phys.org)—The international Cassini mission has spotted what appears to be a miniature extraterrestrial version of the Nile River: a river valley on Saturn's moon Titan that stretches more than 400 km from its 'headwaters' ...

Recommended for you

Bright areas on Ceres suggest geologic activity

December 13, 2017

If you could fly aboard NASA's Dawn spacecraft, the surface of dwarf planet Ceres would generally look quite dark, but with notable exceptions. These exceptions are the hundreds of bright areas that stand out in images Dawn ...

Major space mystery solved using data from student satellite

December 13, 2017

A 60-year-old mystery regarding the source of some energetic and potentially damaging particles in Earth's radiation belts is now solved using data from a shoebox-sized satellite built and operated by University of Colorado ...

Spanning disciplines in the search for life beyond Earth

December 13, 2017

The search for life beyond Earth is riding a surge of creativity and innovation. Following a gold rush of exoplanet discovery over the past two decades, it is time to tackle the next step: determining which of the known exoplanets ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.