Results 21 to 30 of about 9,833 (194)

Ammonia and Phosphine in the Clouds of Venus as Potentially Biological Anomalies

Aerospace, 2022
We are of the opinion that several anomalies in the atmosphere of Venus provide evidence of yet-unknown processes and systems that are out of equilibrium.
Carol E. Cleland, Paul B. Rimmer
doaj   +1 more source

HOW VENUS BECAME COOL: SOCIAL AND MORAL DIMENSIONS OF BIOSIGNATURE SCIENCE

Zygon, 2021
A 2020 scientific report indicated the presence of phosphine, a potential biosignature chemical, in the atmosphere of Venus. As a result, Venus instantly became a global cultural celebrity.
doaj   +2 more sources

A Statistical Approach to Illustrate the Challenge of Astrobiology for Public Outreach

Life, 2017
In this study, we attempt to illustrate the competition that constitutes the main challenge of astrobiology, namely the competition between the probability of extraterrestrial life and its detectability.
Frédéric Foucher, Keyron Hickman-Lewis, Frances Westall, André Brack   +3 more
doaj   +1 more source

High Stellar FUV/NUV Ratio and Oxygen Contents in the Atmospheres of Potentially Habitable Planets [PDF]

, 2013
Recent observations of several planet-hosting M dwarfs show that most have FUV/NUV flux ratios 1000 times greater than that of the Sun. Here we show that the atmospheric oxygen contents (O2 and O3) of potentially habitable planets in this type of UV ...
France, Kevin, Linsky, Jeffrey L., Mauas, Pablo J. D., Tian, Feng, Vieytes, Mariela C.   +4 more
core   +2 more sources

A Spectral Comparison of Jarosites Using Techniques Relevant to the Robotic Exploration of Biosignatures on Mars

Life, 2018
The acidic sulfate-rich waters of the Meridiani Planum region were potentially a habitable environment for iron-oxidizing bacteria on ancient Mars. If life existed in this ancient martian environment, jarosite minerals precipitating in these waters may ...
Liane Loiselle, Michael A. McCraig, M. Darby Dyar, Richard Léveillé, Sean R. Shieh, Gordon Southam   +5 more
doaj   +1 more source

The Role of N2 as a Geo-Biosignature for the Detection and Characterization of Earth-like Habitats [PDF]

, 2019
Since the Archean, N2 has been a major atmospheric constituent in Earth's atmosphere. Nitrogen is an essential element in the building blocks of life, therefore the geobiological nitrogen cycle is a fundamental factor in the long term evolution of both ...
Cubillos, Patricio E., Fossati, Luca, Grenfell, John Lee, Lammer, Helmut, Lendl, Monika, Scherf, Manuel, Sproß, Laurenz   +6 more
core   +2 more sources

SPECULOOS exoplanet search and its prototype on TRAPPIST [PDF]

, 2017
One of the most significant goals of modern science is establishing whether life exists around other suns. The most direct path towards its achievement is the detection and atmospheric characterization of terrestrial exoplanets with potentially habitable
A Burrows, A Collier Cameron, A Wolszczan, Adam J. Burgasser, AR Belu, B Goldman, C Hayashi, C Terquem, CH Blake, CP Johnstone, D Deming, D Kubas, E Agol, E Berger, E Bolmont, E Bolmont, E Jehin, EE Mamajek, ET Whelan, Eunkyu Han, GÁ Bakos, IN Reid, IN Reid, J Leconte, J Muzerolle, J Wit de, J Wit de, J. Schneider, JCB Papaloizou, JD Kirkpatrick, JD Kirkpatrick, JE Gizis, JE Owen, JE Owen, JK Barstow, JN Winn, JS Pineda, KL Luhman, KL Luhman, KL Luhman, L Kaltenegger, L Ricci, L Zeng, M Gillon, M Gillon, M Gillon, M Gillon, M Jura, M Mayor, MC Cushing, MJ Holman, MJ Payne, MY He, P Cresswell, P. Figueira, Philip S. Muirhead, PJ Wheatley, PS Muirhead, R Klein, R Luger, R Luger, R Montgomery, RK Kopparapu, RL Akeson, S Ballard, S Jin, S Seager, S Seager, Sergio B. Dieterich, SJ Schmidt, SN Raymond, SS Kumar, SS Kumar, Stanimir A. Metchev, V Bourrier, X Bonfils, Y Alibert, Y Shvartzvald, ZK Berta   +78 more
core   +1 more source

Classification of the Biogenicity of Complex Organic Mixtures for the Detection of Extraterrestrial Life

Life, 2021
Searching for life in the Universe depends on unambiguously distinguishing biological features from background signals, which could take the form of chemical, morphological, or spectral signatures.
Nicholas Guttenberg, Huan Chen, Tomohiro Mochizuki, H. James Cleaves   +3 more
doaj   +1 more source

Robust monomer-distribution biosignatures in evolving digital biota [PDF]

, 2011
Because organisms synthesize component molecules at rates that reflect those molecules' adaptive utility, we expect a population of biota to leave a distinctive chemical signature on their environment that is anomalous given the local (abiotic) chemistry.
Abelson P.H., Benner S.A., Christoph Adami, Evan D. Dorn   +3 more
core   +3 more sources

Exoplanet Biosignatures: Observational Prospects [PDF]

Astrobiology, 2018
part of a series of 5 review manuscripts of the NExSS Exoplanet Biosgnatures ...
Fujii, Yuka, Angerhausen, Daniel, Deitrick, Russell, Domagal-Goldman, Shawn, Grenfell, John Lee, Hori, Yasunori, Kane, Stephen R, Pallé, Enric, Rauer, Heike, Siegler, Nicholas, Stapelfeldt, Karl, Stevenson, Kevin B   +11 more
openaire   +7 more sources