Scientists have introduced a new strategy to detect extraterrestrial life in a recent breakthrough, marking a new shift from relying on identifying specific biological markers.
According to a team led by Associate Professor Harrison B. Smith of the Institute of Science Tokyo’s Earth-Life Science Institute (ELSI) and specially appointed Associate Professor Lana Sinapayen, life beyond Earth can be identified by patterns that emerge across groups of planets.
This new approach, called ‘Agnostic Biosignature’, will bring about a paradigm shift in astrobiology where the determination of extraterrestrial life is based on ambiguous and unreliable biosignatures, leading to false positives.
According to the study published in The Astrophysical Journalthe agnostic biosignature methodology does not depend on information about the existence of life and how it works. Instead, this approach revolves around two assumptions:
- First, life can move between planets via panspermia.
- Second, life can gradually change surrounding environments over time.
To test this hypothesis, researchers used an agent-based simulation to model the panspermia-like spread of life across galaxies and its subsequent impact on planetary evolution.
The findings revealed that as life spreads and changes its environment, it develops statistically significant correlations between a planet’s spatial location and its physical characteristics.
Notably, these large-scale ‘biological patterns’ can be detected even if no individual planet provides a definitive, standalone biosignature.
In addition to detecting the existence of extraterrestrial life, the researcher also developed a way to identify which planets are likely to harbor these traces of extraterrestrial life. According to scientists, it is possible to find clusters formed by biological activity if we arrange the planets according to common features and their position in space.
Lana Sinapayen said: “Even if life elsewhere is fundamentally different from life on Earth, its large-scale effects, such as planetary dispersal and modification, can still leave observable traces. That makes this approach compelling.”
Although the recent study is based on simulations, future research based on planetary data and realistic models will yield more productive results.
