Results 51 to 60 of about 3,615 (185)

Biological methane production under putative Enceladus-like conditions

Nature Communications, 2018
Many methanogenic archaea use H2 and CO2 to produce methane. Here, Taubner et al. show that Methanothermococcus okinawensis produces methane under conditions extrapolated for Saturn’s icy moon, Enceladus, and estimate that serpentinization may produce ...
Ruth-Sophie Taubner, Patricia Pappenreiter, Jennifer Zwicker, Daniel Smrzka, Christian Pruckner, Philipp Kolar, Sébastien Bernacchi, Arne H. Seifert, Alexander Krajete, Wolfgang Bach, Jörn Peckmann, Christian Paulik, Maria G. Firneis, Christa Schleper, Simon K.-M. R. Rittmann   +14 more
doaj   +1 more source

Exploratory data analysis (EDA) machine learning approaches for ocean world analog mass spectrometry

Frontiers in Astronomy and Space Sciences, 2023
Many upcoming and proposed missions to ocean worlds such as Europa, Enceladus, and Titan aim to evaluate their habitability and the existence of potential life on these moons.
Victoria Da Poian, Victoria Da Poian, Victoria Da Poian, Bethany Theiling, Lily Clough, Brett McKinney, Jonathan Major, Jingyi Chen, Sarah Hörst   +8 more
doaj   +1 more source

The Fall of a Giant. Chemical evolution of Enceladus, alias the Gaia Sausage [PDF]

, 2019
We present the first chemical evolution model for Enceladus, alias the Gaia Sausage, to investigate the star formation history of one of the most massive satellites accreted by the Milky Way during a major merger event. Our best chemical evolution model for Enceladus nicely fits the observed stellar [$\alpha$/Fe]-[Fe/H] chemical abundance trends, and ...
arxiv   +1 more source

The SkyMapper-Gaia RVS view of the Gaia-Enceladus-Sausage -- an investigation of the metallicity and mass of the Milky Way's last major merger [PDF]

, 2020
We characterize the Gaia-Enceladus-Sausage kinematic structure recently discovered in the Galactic halo using photometric metallicities from the SkyMapper survey, and kinematics from Gaia radial velocities measurements. By examining the metallicity distribution functions (MDFs) of stars binned in kinematic/action spaces, we find that the $\sqrt{J_R ...
arxiv   +1 more source

Metal Limiting Habitability in Enceladus? Availability of Trace Metals for Methanogenic Life in Hydrothermal Fluids

Journal of Geophysical Research: Planets, Volume 130, Issue 3, March 2025.
Abstract Enceladus' ocean could support methanogenic life in terms of the availability of chemical energy (H2 and CO2) and nutrients (N and P). However, excess energy and nutrients in the ocean raise the question of why they remain abundant if Enceladus is inhabited.
Shuya Tan, Yasuhito Sekine, Takazo Shibuya   +2 more
wiley   +1 more source

Ocean stratification impedes particulate transport to the plumes of Enceladus

Communications Earth & Environment
Water-vapour plumes erupting from Enceladus’ south pole provide a window into the properties of its subsurface ocean, a prime target in the search for life. However, the extent to which plume material represents conditions at Enceladus’ depths is unclear,
Flynn Ames, David Ferreira, Arnaud Czaja, Adam Masters   +3 more
doaj   +1 more source

Method for detecting and quantitating capture of organic molecules in hypervelocity impacts

MethodsX, 2021
Enceladus is a prime candidate in the solar system for in-depth astrobiological studies searching for habitability and life because it has a liquid water ocean with significant organic content and ongoing cryovolcanic activity. The presence of ice plumes
Bahar Kazemi, James S. New, Matin Golozar, Laura D. Casto, Anna L. Butterworth, Richard A. Mathies   +5 more
doaj  

Evaluating Serpentinization as a Source of Phosphite to Microbial Communities in Hydrothermal Vents

Geobiology, Volume 23, Issue 2, March/April 2025.
ABSTRACT Previous studies have documented the presence of phosphite, a reduced and highly soluble form of phosphorus, in serpentinites, which has led to the hypothesis that serpentinizing hydrothermal vents could have been an important source of bioavailable phosphorus for early microbial communities in the Archean.
Joanne S. Boden, Sanjoy M. Som, William J. Brazelton, Rika E. Anderson, Eva E. Stüeken   +4 more
wiley   +1 more source

The pH of Enceladus' ocean [PDF]

, 2015
Observational data from the Cassini spacecraft are used to obtain a chemical model of ocean water on Enceladus. The model indicates that Enceladus' ocean is a Na-Cl-CO3 solution with an alkaline pH of ~11-12. The dominance of aqueous NaCl is a feature that Enceladus' ocean shares with terrestrial seawater, but the ubiquity of dissolved Na2CO3 suggests ...
arxiv   +1 more source

MAPPING OF INNER AND OUTER CELESTIAL BODIES USING NEW GLOBAL AND LOCAL TOPOGRAPHIC DATA DERIVED FROM PHOTOGRAMMETRIC IMAGE PROCESSING [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016
New estimation of fundamental geodetic parameters and global and local topography of planets and satellites provide basic coordinate systems for mapping as well as opportunities for studies of processes on their surfaces.
I. P. Karachevtseva, A. A. Kokhanov, J. F. Rodionova, A. Yu. Zharkova, M. S. Lazareva   +4 more
doaj   +1 more source