Bacteria Thrive in Alien Conditions Beneath Saturn's Moon

Saturn's moon might just be home to alien life, though you won't be getting a phone call from ET anytime soon. Scientists are talking about microscopic organisms swimming in oceans hidden deep beneath Enceladus's frozen crust. Researchers have now proven that certain bacteria can not only survive but actually thrive in the harsh environment of Saturn's sixth-largest moon.

In the lab, teams recreated the specific conditions found under Enceladus and introduced microbes usually found near deep-sea hydrothermal vents. The expectation was grim. With almost no oxygen available, massive amounts of dissolved carbon dioxide, and water that is extremely alkaline, the ocean should have been hostile to any known form of life.

Instead, the results were shocking. These hardy microorganisms tolerated the alien conditions far better than anyone had previously imagined possible. Dr Nozair Khawaja from Freie Universitat Berlin, who co-authored the study, noted that the discovery was a real surprise to the team.

Scientists were stunned. They did not expect such a successful outcome from this specific experiment. A new study suggests Saturn's moon Enceladus could hide alien life within oceans deep beneath its frozen skin. Researchers discovered that bacteria normally found in deep-ocean hydrothermal vents can survive and even thrive when placed in a lab simulation of Enceladus' ocean.

Enceladus is tiny, measuring just 310 miles across, about the width of Arizona. The surface there is brutally cold, often dropping to -201°C or -330°F. Yet, despite this barren, icy exterior, experts view it as one of the most promising spots in our solar system for finding extraterrestrial life. Geothermal processes near its rocky core generate enough heat to keep vast oceans of liquid water flowing underneath.

Near the south pole, plumes of ocean water burst through cracks in the crust, shooting ice particles hundreds of miles into space. NASA's Cassini probe flew right through these plumes multiple times. It gathered samples and analyzed their chemical makeup. The mission revealed signs of hydrothermal activity on the seafloor. These processes could sustain life while providing organic chemicals that act as building blocks for amino acids and proteins.

Now we have concrete proof that life can exist in such hostile oceans. While surface temperatures plummet to -201°C, geothermal heat near the rocky core maintains a liquid world where biology might develop. In their lab tests, scientists used a bacterium called Methanothermococcus okinawensis. This microbe possesses an incredible ability to survive without oxygen. Its metabolism runs on carbon dioxide and hydrogen released by active geological rocks at deep ocean vents.

Co-author Professor Frank Postberg from Freie Universität Berlin explained the significance during an interview with the Daily Mail. 'On early Earth there was no oxygen either, and these ancient microbes have developed under these conditions.' Previously, scientists believed the high pH of Enceladus' ocean made it unsuitable for such organisms. The lab tests proved them wrong. These bacteria are perfectly happy growing in those tough conditions. They even adapted their metabolism to handle low amounts of carbon dioxide.

Professor Postberg cautioned that while life could survive there, it is by no means certain that it actually does! However, there is good news from a separate paper published today. Professor Postberg shows signs of life might be much easier to detect than previously thought. Droplets of ocean eject from Enceladus' south pole when gas-filled bubbles rise and pop. Scientists collected particles of ice ejected through cracks at the South Pole to sample water directly from the sub-surface oceans.

Researchers note that these droplets freeze slowly. This means some chemicals concentrate into specific locations rather than spreading thin. The implications are staggering for our understanding of life's resilience. We must look closer at icy moons before we assume Earth is unique in harboring biology.

Spacecraft will soon be able to sniff out chemical signs of life with far greater ease thanks to a discovery about Saturn's moon Enceladus. Water vapour blasts droplets through cracks in the icy shell, shooting them into space at speeds reaching 620 miles per hour. Scientists long believed these particles would freeze instantly upon leaving the shadow of the planet. New modelling and lab tests prove otherwise. The freezing happens quite slowly instead.

This gradual chill separates most components within the water. Salts and other minerals get pushed to different spots inside each droplet. If a frozen drop shatters mid-flight, it leaves behind tiny fragments packed with a highly concentrated sample of just one substance. That natural process will be particularly helpful if scientists want to hunt for subtle chemical signatures of life beneath the ocean.

'Enceladus actually does a lot of the work for us in preparing samples for analysis that usually take a lot of effort in chemical labs on Earth,' said Dr Postberg. If a droplet did contain the chemical biosignature of life, this freezing and shattering process could create tiny ice particles with a high concentration of these chemicals in a relatively pure form. That would make any biosignatures significantly easier to spot, even with the level of technology currently available.

None of this means that Enceladus does harbour life right now. But if there is life hiding down there, Professor Postberg said 'we now have a good chance to detect it'. He added: 'We should go back there and find out.' The window for discovery is open, but time might not be on our side forever.