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February 5, 2026, 01:20 PM - 6 min read
Planets larger than Earth but smaller than Neptune are the most common type of known exoplanet. It was for one of these planets, K2-18b, that a bold claim of a detection of a biosignature was made in 2025.
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April 25, 2025, 03:31 PM - 8 min read
The researchers found strong evidence of a chemical called dimethyl sulfide (DMS) in the planet’s atmosphere. On Earth, DMS is produced only by living organisms, so it appears to be a compelling sign of life, or “biosignature”.
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September 6, 2024, 09:29 AM - 6 min read
It’s hard to imagine, but there are organisms living in Earth’s lightless habitats, deep underground or at the bottom of the sea, that give us an idea what alien life without a circadian rhythm may be like.
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