Saturn’s Titan could be harbouring methane-based life form
Cornell University researchers have proposed a new type of methane-based, oxygen-free life form that could have thrived on Saturn’s moon, Titan. Researchers have modeled the new life form that can metabolize and reproduce similar to life on Earth.
Taking a simultaneously imaginative and rigidly scientific view, chemical engineers and astronomers offer a template for life that could thrive in a harsh, cold world – specifically Titan, the giant moon of Saturn. A planetary body awash with seas not of water, but of liquid methane, Titan could harbor methane-based, oxygen-free cells.
Albeit hypothetical, the cell membrane, which has been made up of small organic nitrogen compounds, was able to function in extremely cold liquid methane temperatures, a necessity for worlds with harsh and cold environments such as the Titan, Saturn’s giant moon, which could harbor methane-based and oxygen-free cells and has seas made of liquid methane.
“We’re not biologists, and we’re not astronomers, but we had the right tools,” said chemical molecular dynamics expert Paulette Clancy. “Perhaps it helped, because we didn’t come in with any preconceptions about what should be in a membrane and what shouldn’t. We just worked with the compounds that we knew were there and asked, ‘If this was your palette, what can you make out of that?'”
The cell membrane is dubbed “azotosome.” “Azote” is the French word for nitrogen. “Liposomes,” on the other hand, is hailed from the Greek words “lipos” and “soma,” which mean “lipid body” and thus “azotosome” means “nitrogen body.” Azotosome was composed of carbon, nitrogen and hydrogen molecules known to exist in the cold seas of Titan but exhibit the same flexibility and stability of the analogous liposome on Earth.
Many astronomers look for signs of life in extraterrestrial worlds in the so-called circumstellar habitable zone, where liquid water can exist, basically because life on Earth is based on phospholipid bilayer membrane, the water-based vesicle, where the organic matter of each cell is housed. Researchers are exploring the idea of cells that are not based on water but on methane and have very low freezing point.
With the initial proof of concept on hand, the researchers said that the next step would be to try to demonstrate how the cells would behave in a methane environment to see what would be equivalent to metabolism and reproduction in oxygen-free, methane-based cells.
The study is published in Science Advances.