By Maddie Stone
Move over Europa, there's another moon out to claim the title of first place we'll discover extraterrestrial life. New research from Cornell University finds that alien microbes could, just maybe, eek it out on Saturn's largest moon, Titan. But these critters wouldn't be like anything we've ever seen before—not even close.
That's because Titan, awash in oceans of liquid methane and a blistering minus 178 degrees Celsius at its surface, is a hellish wasteland by Earth standards. And yet, as demonstrated in a new paper, Titan may harbour methane based, oxygen-free cells that metabolise, reproduce, and do everything else that life on Earth does.
An azotosome, the hypothetical, methane-based cell that might live in Titan's oceans. Image: James Stevenson
A press release from Cornell explains how the researchers used some creative chemical modelling to construct a hypothetical, methane-based cell that's stable in Titan's sub-zero oceans. They call their alien life form an "azotosome" :
The azotosome is made from nitrogen, carbon and hydrogen molecules known to exist in the cryogenic seas of Titan, but shows the same stability and flexibility that Earth's analogous liposome does. This came as a surprise to chemists like Clancy and Stevenson, who had never thought about the mechanics of cell stability before; they usually study semiconductors, not cells...Excited by the initial proof of concept, Clancy said the next step is to try and demonstrate how these cells would behave in the methane environment – what might be the analogue to reproduction and metabolism in oxygen-free, methane-based cells.
I was excited enough about the prospect of life beneath the icy surface of Saturn's Enceladus. Now it's only a matter of time before astronomers send a life-hunting probe or two out to the ringed gas giant's moons. Who knows what we'll dig up. [Cornell Chronicle]
Top image via NASA / JPL-Caltech