Scientists listen for alien signals on K2-18b but detect only cosmic silence
What’s special about K2-18b? Listening for alien tech Millions of signals, but no aliens Importance of silence How is it an achievement The search continues
What’s special about K2-18b? Listening for alien tech Millions of signals, but no aliens Importance of silence How is it an achievement The search continues The world of science is full of mysteries and the astronomers explore these mysteries daily. In the most recent update, astronomers recently carried out one of the most detailed radio searches ever on exoplanet K2-18b, which many consider one of the most promising places to search for life beyond our solar system. What they found will surely surprise your senses. Scroll down to find out.According to a research published in The Astronomical Journal, researchers used powerful radio telescopes and sophisticated data-analysis techniques to explore exoplanet K2-18b. The study does not rule out life on K2-18b but it helps refine future searches for intelligent civilizations and shows how fast the search for extraterrestrial intelligence (SETI) is moving forward.For the uninitiated, K2-18b is much bigger than Earth and it's now one of the leading candidates for what scientists call a Hycean world — a planet that might have a huge global ocean under a hydrogen-rich atmosphere.
K2-18b has gained even more attention since the James Webb Space Telescope spotted signs of gases, including methane and carbon dioxide, in its atmosphere. These discoveries have led to speculation that microbial life, or even more complex ecosystems, might exist on the planet.According to experts, the latest study was not about looking for biological signs, but for technosignatures, signals that could point to the existence of advanced technology. The study states that the scientists used two of the world’s top radio observatories: the Karl G. Jansky Very Large Array (VLA) in the United States, and South Africa’s MeerKAT radio telescope. The duo studied K2-18b across a wide swath of radio frequencies, using advanced software to comb through millions of signals they detected. And the motive was to look for narrow-band radio emissions or other anomalous signals that are difficult to explain within the framework of natural astrophysical phenomena.If we go by the published research, the radio telescopes received huge amounts of radio signals during the observations, but almost all turned out to be radio frequency interference from Earth-based technology such as satellites, communication systems and electronic devices.
Later, researchers carefully filtered out these false positives with sophisticated algorithms and there was no convincing evidence of an artificial transmission from K2-18b.And at last, the search concluded with no extraterrestrial signals detected. But if scientists are to be believed, even the silence is an important and necessary part of SETI research, as such silence also helps improve detection techniques for the future.According to researchers, the lack of detectable radio signals doesn't imply K2-18b is without life. Explaining the importance of silence, scientists say that "if it has life, it may be microbial, not intelligent.” Even if an advanced civilization is out there, it might not be using radio communication, or it might be transmitting at frequencies not covered by the survey. Scientists also note that humans have only been broadcasting detectable radio signals for about a century, so the detection of another civilization depends on both civilizations using compatible technology during overlapping time periods. And hence, SETI scientists are careful not to interpret silence too strongly as evidence for the non-existence of intelligent life.While no alien message was found, researchers say the project is an important technological achievement.
The BriefWire