Chemical trail on Saturn's Moon Titan may be key to prebiotic conditions

An image of Titan's surface, as taken by the European Space Agency's Huygens probe as it plunged through the moon's thick, orange-brown atmosphere on Jan. 14, 2005. Today, Cornell scientists have chemical evidence that suggests prebiotic conditions may exist there.

NASA's Cassini and Huygens missions have provided a wealth of data about chemical elements found on Saturn's moon Titan, and Cornell scientists have uncovered a chemical trail that suggests prebiotic conditions may exist there.

Titan, Saturn's largest moon, features terrain with Earthlike attributes such as lakes, rivers and seas, although filled with liquid methane and ethane instead of water. Its dense atmosphere -- a yellow haze -- brims with nitrogen and methane. When sunlight hits this toxic atmosphere, the reaction produces hydrogen cyanide -- a possible prebiotic chemical key.

"This paper is a starting point, as we are looking for prebiotic chemistry in conditions other than Earth's," said Martin Rahm, postdoctoral researcher in chemistry and lead author of the new study, "Polymorphism and Electronic Structure of Polyimine and Its Potential Significance for Prebiotic Chemistry on Titan," published in the Proceedings of the National Academy of Sciences, July 4.

To grasp the blueprint of early planetary life, Rahm said we must think outside of green-blue, Earth-based biology: "We are used to our own conditions here on Earth. Our scientific experience is at room temperature and ambient conditions. Titan is a completely different beast." Although Earth and Titan both have flowing liquids, Titan's temperatures are very low, and there is no liquid water. "So if we think in biological terms, we're probably going to be at a dead end," he said.

Hydrogen cyanide is an organic chemical that can react with itself or with other molecules -- forming long chains, or polymers, one of which is called polyimine. The chemical is flexible, which helps mobility under very cold conditions, and it can absorb the sun's energy and become a possible catalyst for life.

"Polyimine can exist as different structures, and they may be able to accomplish remarkable things at low temperatures, especially under Titan's conditions," said Rahm, who works in the lab of Roald Hoffmann, winner of the 1981 Nobel Prize in chemistry and Cornell's Frank H.T. Rhodes Professor of Humane Letters Emeritus. Rahm and the paper's other scientists consulted with Hoffmann on this work.

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