Separate measurement from interpretation

A proposed biosignature is an observation interpreted as possibly produced by life. The observation can be sound even while its explanation is uncertain.

Source: NASA Astrobiology

Test the alternatives

NASA’s Ladder of Life Detection provides a framework for discussing biosignatures and measurements. Context and possible non-biological mechanisms are central to assessing a claim.

Source: NASA Astrobiology

Read the exact claim

Ask whether a paper reports a detected molecule, a suitable environment, a potential biological origin or a demonstrated organism. These conclusions require different evidence.

Sources

NASA AstrobiologyPrimary source

Ladder of Life Detection

Official sourceResearch framework

A framework for assessing proposed biosignatures and alternative explanations.

Published: not specified · Accessed: 2026-10-02
Source

Record history

  • Version 1 · Oct 2, 2026 — Initial source-led edition