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Home Science News

“Scientists Uncover ‘Strongest Evidence Yet’ of Life on Distant Planet”

by Ismail Shaikh
April 18, 2025
in Science News, World News
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Scientists Discover Potential Signs of Life on Distant Exoplanet K2-18b

A team of scientists from the University of Cambridge has detected new, though tentative, evidence suggesting the presence of life on the distant exoplanet K2-18b, which orbits a star far beyond our solar system. Their findings indicate the presence of molecules in the planet’s atmosphere that, on Earth, are typically associated with biological activity.

This discovery, made using NASA’s James Webb Space Telescope (JWST), marks the second time these chemicals have been detected in K2-18b’s atmosphere, adding weight to the hypothesis that the planet may harbor life. However, the team and independent experts caution that additional data is necessary to confirm the results definitively.

The lead researcher, Professor Nikku Madhusudhan, expressed optimism about obtaining conclusive evidence soon. “This is the strongest evidence yet that there could be life out there,” he stated. “We realistically expect to confirm this signal within one to two years.”

K2-18b is located 124 light-years away from Earth and is about 2.5 times the size of our planet. The JWST’s advanced capabilities allow it to analyze the chemical composition of distant planets by studying the light that passes through their atmospheres. In this case, the Cambridge team has found signs of two molecules—dimethyl sulfide (DMS) and dimethyl disulfide (DMDS)—which, on Earth, are produced by marine phytoplankton and bacteria. The amount of these gases detected is reportedly thousands of times higher than their presence on Earth, which, if confirmed, could suggest that K2-18b is teeming with life.

Professor Madhusudhan believes that confirmation of life on K2-18b would have profound implications for the understanding of life in the universe. “If we confirm that life exists on K2-18b, it would imply that life is common in the galaxy,” he said.

However, there are still significant uncertainties surrounding these findings. The data currently available is not sufficient to make a definitive claim, as it only reaches a 99.7% certainty, or a three-sigma result. Scientific consensus typically requires a five-sigma result (99.99999% certainty) to consider a discovery conclusive. Professor Madhusudhan and his team are working to refine their data and achieve the necessary certainty.

Moreover, independent experts caution against prematurely declaring a biological origin for the detected molecules. Professor Catherine Heymans, the Astronomer Royal for Scotland, noted that while DMS and DMDS are linked to life on Earth, they could also be produced by non-biological processes, and further investigation is required to rule out alternative explanations.

Despite these challenges, the Cambridge team is hopeful that additional observations will soon provide a clearer picture. “This could be the tipping point where the fundamental question of whether we are alone in the universe becomes answerable,” said Professor Madhusudhan.

The study has been published in The Astrophysical Journal Letters, and researchers are continuing their efforts to explore the potential for life on other planets.

Also Read : “Kesari Chapter 2 Celeb Reviews: Vicky Kaushal, Urmila Matondkar Praise Akshay Kumar, Ananya Panday, and R. Madhavan as ‘Absolute Magic’”

Tags: AstrobiologyAstronomical ResearchbreakingnewsExoplanet DiscoveryJames Webb Space TelescopeK2-18bPotential Life on Other Planets
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