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A biosignature (sometimes called chemical fossil or molecular fossil) is any substance – such as an element, isotope, molecule, or phenomenon – that provides...

an informal unit of geologic time, subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale. It spans from the formation of...

estimated to have occurred between 3.5 and 2.4 billion years ago during the Archean eon, prior to the Great Oxygenation Event and Huronian glaciation. Retinal-containing...

Astrobiology: Records of Life on Earth and the Search for Extraterrestrial Biosignatures. Cellular Origin, Life in Extreme Habitats and Astrobiology. Vol. 12...

telescopic investigations and deployed probes, searching for water, chemical biosignatures in the soil and rocks at the planet's surface, and biomarker gases in...

environments in the Solar System and beyond, the search for planetary biosignatures of past or present extraterrestrial life, and the study of the origin...

widely in the fossil record of the Precambrian but are rare today. Very few Archean stromatolites contain fossilized microbes, but fossilized microbes are...

at Pennsylvania State University where her dissertation topic was "Late Archean microbial ecology: an integration of molecular isotopic, and lithologic...

environmental changes makes them helpful when reconstructing past environments. Biosignature Biostratigraphy Chemostratigraphy Gunflint microfossils Macrofossil Protists...

fossils. Some fossils are biochemical and are called chemofossils or biosignatures. Gathering fossils dates at least to the beginning of recorded history...

of purple retinal pigments on Earth and implications for exoplanet biosignatures". International Journal of Astrobiology. 20 (3): 241–250. arXiv:1810...

with a correspondingly larger original volume. This volume overlies the Archean age Indian Shield, which is likely the lithology the province passed through...

embedded in the carbonate. If found on Earth it would be a very strong biosignature. However, in 2001, scientists were able to explain and produce carbonate...

scientist at NASA Goddard Space Flight Center, who specializes in exoplanets, Archean geochemistry, planetary atmospheres, and astrobiology. Domagal-Goldman...

Astrobiology: Records of Life on Earth and the Search for Extraterrestrial Biosignatures. Cellular Origin, Life in Extreme Habitats and Astrobiology. Vol. 12...

Rare Earth criteria: surface water, tectonic plates, a large moon and biosignatures are currently undetectable. Though planets the size of Earth are difficult...

increase in the value of the δ34S in the remaining sulfate in the seawater. Archean pyrite found in barite in the Warrawoona Group, Western Australia, with...

structures (MISS); microfossils; microbial mat fabrics; and biosignatures. These fossils and biosignatures are preserved within hydrothermal dikes, barite mounds...

enhance human health and the environment. Biology, the study of life Biosignature Carbon-based life Central dogma of molecular biology History of life...

Chemical Disequilibrium in Earth-like Planetary Atmospheres a Biosignature versus an Anti-biosignature? Disequilibria from Dead to Living Worlds". The Astrophysical...