Surfing onTitan would be best in summer

March 4, 2016 by Evan Gough, Universe Today
Surfing onTitan would be best in summer
The view from the beach on Titan? Credit: NASA

Space is mostly vast and empty. So whenever we notice something like ripples on a lake, on the frozen moon of a gas giant, we take notice.

At a meeting of the American Geophysical Union in San Francisco this week, it was reported that Cassini images of Saturn's moon Titan showed light being reflected from the Ligeia Mare, a frigid sea of hydrocarbons on that moon. Subsequent images showed the same phenomenon on two other seas of Titan, as well. These are thought to be waves, the first waves detected anywhere other than Earth, and suggest that Titan has more geophysical activity than previously thought.

Surfers on Earth, known for seeking out remote and secretive locations, shouldn't get too excited. According to mathematical modelling and radar imagery, these waves are only 1.5 cm (0.6 inches) tall, and they're moving only 0.7 metres (2.3 feet) per second. Plus, they're on a sea of liquid hydrocarbons—mostly methane—that is a frigid -180 degrees Celsius (-292 F.)

Planetary scientists are taking note, though, because these waves show that Titan has an active environment, rather than just being a moon frozen in time. It's thought that the change in seasons on Titan is responsible for these waves, as Titan begins its 7 year summer. Processes related to the changing seasons on Titan have created winds, which have cause these ripples.

Surfing onTitan would be best in summer
The left image shows a mosaic of images of Titan taken by the Cassini spacecraft in near infrared light. Titan’s polar seas are visible as sunlight glints off of them. The right image is a radar image of Kraken Mare. Credit: NASA Jet Propulsion Laboratory

There's other evidence of active weather on Titan, including dunes, river channels, and shorelines. But this is the first observation of active weather phenomena, rather than just the results. All together, it shows that Titan is a more active, dynamic environment than previously thought.

Titan's hydrocarbon lakes are thought to be up to 200 metres (656 ft.) deep, and are clustered around the north polar region. Just one of its lakes is thought to contain approximately 9,000 cubic km of methane, which is about 40 times more than the Earth's reserves of oil and gas.

Titan is the second largest in the Solar System, second only to Ganymede, and both moons are larger than the planet Mercury. Titan was discovered in 1655 by Christiaan Huygens.

Explore further: Cassini sheds light on Titan's second largest lake, Ligeia Mare

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HannesAlfven
1.6 / 5 (7) Mar 04, 2016
The article makes no mention that former attempts to do the same revealed no waves at all. There seems to be a rush to latch onto any data which makes their case.

One has to imagine that this is what it was like when the Rosetta mission was being planned, when the assumption that it was simply a block of ice was never authentically questioned, and subsequently turned into engineering plans for ice screws that could not grab onto rock.
barakn
4 / 5 (4) Mar 04, 2016
"Specular Reflections from Titan's Punga Mare Seen by Cassini VIMS Indicate Surface Roughness: Waves?" http://www.hou.us...1947.pdf

Your thesis was totally destroyed the last time we had this argument. http://phys.org/n...oth.html Don't you ever get sick of being wrong?
DrBaldo
1 / 5 (1) Mar 05, 2016
"...Titan has an active environment, rather than just being a moon frozen in time..."

Nothing is frozen.
Everything is evolving.
Hang 10 on Titan. ~ Matsuo Basho

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