Results 111 to 120 of about 11,414 (233)

Comparative Biosignatures

The discovery of inhabited exoplanets hinges on identifying biosignature gases. JWST is revealing potential biosignatures in exoplanet atmospheres, though their presence is yet to provide strong evidence for life. The central challenge is attribution: how to confidently identify biogenic sources while ruling out, or deeming unlikely, abiotic ...
Constantinou, Tereza, Shorttle, Oliver, Cranmer, Miles, Rimmer, Paul B.   +3 more
openaire   +2 more sources

Detecting Biosignatures in Complex Molecular Mixtures From Pyrolysis‐Gas Chromatography‐Mass Spectrometry Data Using Machine Learning

Journal of Geophysical Research: Machine Learning and Computation
Understanding how measured molecular signals can distinguish the chemistry of life from the chemistry of the nonliving world is a central focus of astrobiology and paleobiology.
Grethe Hystad, H. James Cleaves II, Collin A. Garmon, Michael L. Wong, Anirudh Prabhu, George D. Cody, Robert M. Hazen   +6 more
doaj   +1 more source

An Objective Bayesian Analysis of Life's Early Start and Our Late Arrival

, 2020
Life emerged on the Earth within the first quintile of its habitable window, but a technological civilization did not blossom until its last. Efforts to infer the rate of abiogenesis, based on its early emergence, are frustrated by the selection effect ...
Kipping, David
core  

Iron isotope biosignatures: Promise and progress [PDF]

, 2001
Ariel D. Anbar
openalex   +1 more source

Extreme Forward Scattering Observed in Disk-averaged Near-infrared Phase Curves of Titan

The Planetary Science Journal
Titan, with its thick and hazy atmosphere, is a key world in our solar system for understanding light scattering processes. NASA’s Cassini mission monitored Titan between 2004 and 2017, where the derived data set includes a large number of whole disk ...
Chase Cooper, Tyler D. Robinson, Jason W. Barnes, L. C. Mayorga, Lily Robinthal   +4 more
doaj   +1 more source

Habitability and biosignatures

Preprint of a chapter for the 'Encyclopedia of Astrophysics' (Editor-in-Chief Ilya Mandel, Section Editor Dimitri Veras) to be published by Elsevier as a Reference ...
openaire   +2 more sources

Morphological Biosignatures and the Search for Life on Mars [PDF]

, 2003
Sherry L. Cady, Jack D. Farmer, J. P. Grotzinger, J. William Schopf, A. Steele   +4 more
openalex   +1 more source

An exploration of origin of life for exoplanetary science

Frontiers in Astronomy and Space Sciences
The factors that enable life to begin define the difference between an inhabited planet and one that is simply habitable. While used extensively in Origins, Worlds, and Life: A Decadal Strategy for Planetary Science and Astrobiology 2023–2032 ...
Finnegan Keller, Tiffany Kataria, Laura M. Barge, Pin Chen, Yuk Yung, Jessica M. Weber   +5 more
doaj   +1 more source

Biosignatures and abiotic constraints on early life [PDF]

, 2006
Barbara Sherwood Lollar, T. M. McCollom
openalex   +1 more source

Metabolic Processes Preserved as Biosignatures in Iron-Oxidizing Microorganisms: Implications for Biosignature Detection on Mars [PDF]

Iron-oxidizing bacteria occupy a distinct environmental niche. These chemolithoautotrophic organisms require very little oxygen (when neutrophilic) or outcompete oxygen for access to Fe(II) (when acidophilic).
Emerson, David, Floyd, Melissa A. Merrill, Grubisic, Andrej, Williams, Amy J.   +3 more
core   +1 more source