Researchers have analyzed millions of mystery signals from the Earth-like exoplanet K2-18b, finding no evidence of intelligent alien life. The Search for Extraterrestrial Intelligence (SETI) project used two of Earth's most powerful radio telescopes to scan the planet for narrow-band radio signals comparable to human technology, but no such signals were detected.
Two Powerful Telescopes Combined in Rare Collaboration
In an unprecedented move, the project combined resources from the Jansky Very Large Array (VLA) in New Mexico and the MeerKAT radio telescope in South Africa. This collaboration provided an exceptionally sensitive search of K2-18b, located approximately 124 light years from Earth in the habitable zone of a red dwarf star.
K2-18b: A Potential Hycean World
Observations from the James Webb Space Telescope have revealed that K2-18b's atmosphere is rich in carbon dioxide and methane, suggesting it could be a "Hycean" world—a planet entirely covered by ocean. Last year, astronomers led by the University of Cambridge reported discovering molecules in the planet's atmosphere that are primarily produced by microbial life on Earth, calling it "the strongest ever signs" of potential alien life.
Despite these promising conditions, the SETI analysis found no artificial radio transmissions. Dr. Matt Burleigh, an astronomer at the University of Leeds, commented on the possibility of alien life on K2-18b: "As for whether any alien life will resemble life on Earth, well we won’t know for certain until we find it."
What Alien Life Might Look Like
Experts have speculated that if life exists on K2-18b, it may not have DNA like humans but could walk on two legs. Dr. Burleigh added: "There are strong arguments that life on other planets would still be based on carbon, utilize similar proteins and amino acids, and would need water to act as a solvent, since these things are common in the Universe."
He further noted: "There are also good arguments that evolution would find the same solutions as it has on Earth. For example, the camera eye (like our eyes) has independently evolved many times in our fossil record. Perhaps it’s just a really good way of seeing! So maybe if one day we meet an alien, it will walk around on two legs and see with eyes that are very much like our own."
The search for extraterrestrial intelligence continues, with K2-18b remaining a prime candidate for future studies due to its potentially life-sustaining conditions.
