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Barnard’s Star exoplanets deemed dry and lifeless

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2026-07-26 14:54 UTC → 2026-07-29 04:19 UTC · added removed

Barnard's Barnard’s Star exoplanet habitability assessment exoplanets deemed dry and lifeless

A University of Cambridge research team examined has refined the characterisation of the four rocky small planets orbiting Barnard's Barnard’s Star, the Sun’s nearest stellar neighbor about six light‑years away. Spectroscopic analysis revealed that neighbour after Alpha Centauri. Discovered in 2025, the star’s chemistry contains worlds are larger than Mars but smaller than Earth and Venus. Spectroscopy of the host star shows an unusually high magnesium relative to silicon, magnesium‑to‑silicon ratio, leading the planets authors to be composed largely of infer a mantle dominated by periclase (magnesium oxide) rather than water‑retaining minerals such as olivine. This mineralogy, combined with the planets’ close, oxide), a mineral that does not retain water. Their tight, tidally‑locked orbits—up to orbits – the outermost planet lies ten times nearer to its star than Mercury is does to the Sun—exposes them Sun – expose the bodies to intense radiation and weak gravity, causing a rapid atmospheric loss of any primitive atmosphere, estimated to have occurred within roughly about two billion years. years, far earlier than the system’s ten‑billion‑year age. The planets are locked in a 9 : 12 : 16 orbital resonance that stabilises the configuration. The study, published in *Monthly Notices of the Royal Astronomical Society*, concluded that concludes the worlds planets are extremely dry, radiation‑burnt and unsuitable for unlikely to support carbon‑based life, while highlighting the role of stellar composition in shaping planet formation around low‑mass stars. and suggests they will serve as benchmarks for forthcoming James Webb and extremely large‑telescope observations.

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  1. 2026-07-29 04:19 UTC Barnard’s Star exoplanets deemed dry and lifeless
  2. 2026-07-26 14:54 UTC Barnard's Star exoplanet habitability assessment

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