Daniel FischerJun 1
Molecular diversity as a #biosignature: https://arxiv.org/abs/2511.00525 -> Scientists used a method from ecology to identify whether icy moons could hold conditions for life: https://theconversation.com/scientists-used-a-method-from-ecology-to-identify-whether-icy-moons-could-hold-conditions-for-life-283855
Molecular diversity as a biosignature

The search for life in the Solar System hinges on data from planetary missions. Detecting biosignatures based on molecular identity, isotopic composition, or chiral excess requires measurements that current and planned missions can only partially provide. We introduce a new class of biosignatures, defined by the statistical organization of molecular assemblages and quantified using diversity metrics. Using this framework, we analyze amino-acid diversity across a dataset spanning terrestrial and extraterrestrial contexts. We find that biotic samples are consistently more diverse -- and therefore distinct -- from their sparser abiotic counterparts. This distinction also holds for fatty acids, indicating that the diversity signal reflects a fundamental biosynthetic signature. It also proves persistent under modeled space-like degradation. Relying only on relative abundances, this biogenicity assessment strategy is applicable to any molecular composition data from archived, current, and planned planetary missions. By capturing a fundamental statistical property of life's chemical organization, it may also transcend biosignatures that are contingent on Earth's evolutionary history.

arXiv.org
Daniel FischerMay 15
Molecular diversity as a #biosignature: https://arxiv.org/abs/2511.00525 -> Scientists propose new way to find aliens — and we may already have a spacecraft that can help (namely the Europa Clipper): https://www.space.com/space-exploration/search-for-life/scientists-propose-new-way-to-find-aliens-and-we-may-already-have-a-spacecraft-that-can-help
Molecular diversity as a biosignature

The search for life in the Solar System hinges on data from planetary missions. Detecting biosignatures based on molecular identity, isotopic composition, or chiral excess requires measurements that current and planned missions can only partially provide. We introduce a new class of biosignatures, defined by the statistical organization of molecular assemblages and quantified using diversity metrics. Using this framework, we analyze amino-acid diversity across a dataset spanning terrestrial and extraterrestrial contexts. We find that biotic samples are consistently more diverse -- and therefore distinct -- from their sparser abiotic counterparts. This distinction also holds for fatty acids, indicating that the diversity signal reflects a fundamental biosynthetic signature. It also proves persistent under modeled space-like degradation. Relying only on relative abundances, this biogenicity assessment strategy is applicable to any molecular composition data from archived, current, and planned planetary missions. By capturing a fundamental statistical property of life's chemical organization, it may also transcend biosignatures that are contingent on Earth's evolutionary history.

arXiv.org
michaelApr 17

15-Apr-2026
A new way to detect life beyond Earth without knowing what life looks like
Researchers propose a population-scale #biosignature based on how life may spread between #planets

https://www.eurekalert.org/news-releases/1123571

#science #astrobiology #exoplanets

A new way to detect life beyond Earth without knowing what life looks like

Researchers from the Earth-Life Science Institute (ELSI) and National Institute for Basic Biology have developed a new method to detect extraterrestrial life without relying on traditional biosignatures. By modelling how life might spread between planets, they demonstrate that life could be detected through statistical patterns across planetary populations rather than on individual planets. This "agnostic biosignature" approach could assist in guiding future searches for life beyond Earth.

EurekAlert!
Mikko TuomiMar 19

Here is a problem that has been quietly gnawing at astronomers for decades.

The standard approach to detecting #life on other worlds involves scanning #exoplanet #atmospheres for #oxygen, #methane, and #ozone, whose presence is difficult to explain without #biology.

It's a clever idea, but it carries a hidden flaw. That entire shopping list was written by studying Earth. It is, inevitably, a search for life like us.

The list of ways that #chemistry alone can accidentally mimic these #biosignature gases is growing faster than the list of new ways to detect life.

Each new false positive scenario demands even more information about the #planet to rule it out, and there is a genuine question about whether that information can ever be gathered exhaustively.

But there is a solution.

#Assembly theory doesn't ask what #molecules are present in an #atmosphere. Instead, it asks how hard they were to make.

Every molecule can be assigned an assembly index, a minimum number of construction steps required to build it from basic #chemical building blocks.

Simple molecules are easy to assemble by chance, but truly complex ones, requiring many sequential steps, don't arise without something doing a great deal of deliberate selection.

That something would then be life itself.

#astrobiology #astronomy
https://phys.org/news/2026-03-life.html

Paper by Walker et al. (2026): https://arxiv.org/abs/2603.11086

Life, but not as we know it

Here is a problem that has been quietly gnawing at astronomers for decades. The standard approach to detecting life on other worlds involves scanning exoplanet atmospheres for oxygen, methane, and ozone, whose presence is difficult to explain without biology. It's a clever idea, but it carries a hidden flaw. That entire shopping list was written by studying Earth. It is, inevitably, a search for life like us.

Phys.org
Knowledge ZoneMar 18

#KnowledgeByte: An #Alien #Biosignature is any observable feature—such as a substance, pattern, or phenomenon—that provides scientific evidence of past or present life beyond Earth.

Scientists look for these "fingerprints of life" in the atmospheres and on the surfaces of planets and moons.

https://knowledgezone.co.in/posts/Alien-Biosignature-69b9060ffa60ffdd1b7b92e7

Mashable India [Unofficial]Nov 29, 2025

3I/ATLAS: ALMA Detects Most Enriched Concentration Of Methanol And Hydrogen Cyanide Observed In Any Comet Ever

https://fed.brid.gy/r/https://in.mashable.com/science/103046/3iatlas-alma-detects-most-enriched-concentration-of-methanol-and-hydrogen-cyanide-observed-in-any-co

Home [Unofficial]Nov 25, 2025

Scoperte possibili grotte carsiche su Marte: nuovi indizi sulla presenza passata di acqua e vita

https://fed.brid.gy/r/https://www.galaxyaddicted.it/2025/11/grotte-carsiche-marte-hebrus-valles/

Steve Dustcircle 🌹Oct 23, 2025

#Phosphorus Prepared #Earth For Complex #Life And Could Be A Valuable #Biosignature

https://www.universetoday.com/articles/phosphorus-prepared-earth-for-complex-life-and-could-be-a-valuable-biosignature

Phosphorus Prepared Earth For Complex Life And Could Be A Valuable Biosignature

A new study has revealed how phosphorus, a nutrient essential for photosynthesis, surged into ancient oceans and started Earth's first major rise in atmospheric oxygen more than 2 billion years ago.

Universe Today
Soh Kam YungSep 17, 2025

"A potential biosignature, which is how the Sapphire Canyon finding is described, is a substance or structure that might have a biological origin but requires more data or further study before scientists can make a conclusion about the absence or presence of life."

https://theconversation.com/scientists-detected-a-potential-biosignature-on-mars-an-astrobiologist-explains-what-these-traces-of-life-are-and-how-researchers-figure-out-their-source-265157

#Mars #Biosignature #Life #Chemistry #Evidence #Biology

Scientists detected a potential biosignature on Mars – an astrobiologist explains what these traces of life are, and how researchers figure out their source

Unique, spotted rocks in Mars’ Jezero Crater could indicate that the planet once hosted life.

The Conversation
ForensicAI_XSep 13, 2025
Pontential sign of Ancient life☺️
NASA Says Mars Rover Discovered Potential Biosignature Last Year
https://nasa.gov/news-release/nasa-says-mars-rover-discovered-potential-biosignature-last-year/
#Astrobiology #Mars #Mars2020 #Perseverance #JezeroCrater #Mars2020Mission #Nasa #MarsRover #MarsSampleReturn #MSR #Biosignature
NASA Says Mars Rover Discovered Potential Biosignature Last Year - NASA

A sample collected by NASA’s Perseverance Mars rover from an ancient dry riverbed in Jezero Crater could preserve evidence of ancient microbial life. Taken

NASA