A groundbreaking discovery by NASA’s James Webb Telescope has revealed a colossal exoplanet, K2-18 b, possibly harboring life-like gases. Located 120 light-years away, this “Hycean world” is theorized to have a hydrogen-rich atmosphere and potential water oceans.
Methane and carbon dioxide dominate the atmosphere, while hints of dimethyl sulfide (DMS), a gas tied to life, add intrigue. Advanced spectroscopy from Webb has provided insights into K2-18 b’s chemical makeup, hinting at unique processes. Lead researcher Nikku Madhusudhan highlights the potential of Hycean worlds, breaking the rocky-planet norm in life-hunting.
However, K2-18 b’s environment presents hurdles for life, including a high-pressure icy mantle and potential heat. Data from two Webb transits equaled eight years of Hubble observations, demonstrating unparalleled sensitivity. Confirming the presence of DMS would mark a paradigm shift in understanding extraterrestrial life potential.
NASA aims to refine observations, unlocking more secrets of K2-18 b and paving the path toward discovering life beyond Earth.
Source: https://www.businesstoday.in/visualstories/news/120-light-years-away-james-webb-finds-earths-alien-twin-with-a-twist-198974-02-01-2025