A Cambridge research team has reported preliminary evidence that the atmosphere of the distant exoplanet K2‑18b may contain molecules associated with biological activity. Using NASA’s James Webb Space Telescope (JWST), the group detected chemical signatures of dimethyl sulfide (DMS) and dimethyl disulfide (DMDS) — gases on Earth produced by marine plankton and bacteria.
🔭 The Evidence So Far
Lead investigator Prof. Nikku Madhusudhan noted that the concentration of these gases appeared far higher than on Earth. If the link to biology is confirmed, he argues, “this planet would be teeming with life.” Yet the team acknowledges the detection currently stands at three sigma (99.7% confidence) — below the five‑sigma threshold required for a formal discovery.
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⚖️ Scientific Debate
Independent astronomers caution that even a five‑sigma result would not prove life. Prof. Catherine Heymans (University of Edinburgh) stresses that non‑biological processes could also generate these molecules. Other researchers propose alternative models:
🌊 A vast liquid ocean absorbing ammonia.
🌋 A molten interior producing similar chemical signatures.
☁️ A “mini gas giant” without a solid surface.
These competing interpretations highlight the difficulty of inferring planetary structure and chemistry from faint light signals.
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🪐 Broader Implications
If future observations confirm a biological origin, it would suggest that life is common across the galaxy. For now, the Cambridge team is collaborating with other groups to test whether DMS and DMDS can be produced abiotically under laboratory conditions.
Prof. Madhusudhan remains cautiously optimistic: “Decades from now, we may look back and recognize this as the moment when a living universe became within reach.”
Source: BBC News
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