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K2-18b Does Not Meet the Standards of Evidence for Life — The Astronomical Journal

Revision a9b979a6-eab7-4392-9530-8d012c3e6712 · 11/5/2026, 11:06:56 PM UTC

Key: stevenson2025k218b
Authors: Stevenson, Kevin B.; et al.
Issued: 2025
Type: article-journal
Container: The Astronomical Journal
DOI: 10.3847/1538-3881/ae0338
URL: https://arxiv.org/abs/2508.05961

Raw CSL JSON

{
  "DOI": "10.3847/1538-3881/ae0338",
  "URL": "https://arxiv.org/abs/2508.05961",
  "type": "article-journal",
  "title": "K2-18b Does Not Meet the Standards of Evidence for Life",
  "author": [
    {
      "given": "Kevin B.",
      "family": "Stevenson"
    },
    {
      "literal": "et al."
    }
  ],
  "issued": {
    "date-parts": [
      [
        2025
      ]
    ]
  },
  "accessed": {
    "date-parts": [
      [
        2026,
        11,
        6
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  },
  "container-title": "The Astronomical Journal"
}

Claims

prior-claims

Prior assertions of detecting life beyond Earth have either been contradicted or remain under debate.

"prior assertions of detecting extraterrestrial life have either been contradicted or remain under debate"

Locator: section: 1. Introduction · Quote language: en
red-noise

Independent reanalysis concludes that red noise, rather than an astrophysical signal, affects the mid-infrared data, and that there is as yet no statistically significant evidence for biosignatures in K2-18b's atmosphere.

"there is, as yet, no statistically significant evidence for biosignatures in the atmosphere of K2-18b"

Quote language: en

Available in

en - English