Results 51 to 60 of about 265 (182)

Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the String‐Theoretical Swampland Programme

Fortschritte der Physik, Volume 74, Issue 4, April 2026.
Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley   +1 more source

Europa’s H2O2: Temperature Insensitivity and a Correlation with CO2

The Planetary Science Journal
H _2 O _2 is part of Europa’s water-ice radiolytic cycle and a potential source of oxidants to Europa’s subsurface ocean. However, factors controlling the concentration of this critical surface species remain unclear.
Peiyu Wu, Samantha K. Trumbo, Michael E. Brown, Katherine de Kleer   +3 more
doaj   +1 more source

Galilean satellite ephemerides E5 [PDF]

Astronomy and Astrophysics Supplement Series, 1998
New ephemerides of Jupiter's Galilean satellites are produced from an analysis of CCD astrometric data, Voyager-mission optical navigation images, mutual event observations, photographic plates, and eclipse timing observations. The resulting parameters, for use in the galsat computer software, are in the B1950 frame for use by the Galileo space mission.
openaire   +1 more source

Modeling Ganymede's Surface Charging in Preparation for the JUICE Mission

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract The European Space Agency's (ESA) JUICE mission (JUpiter ICy moons Explorer) is en route to the Jovian system to characterize Ganymede's subsurface ocean. Determining the ocean's conductivity and depth requires precise measurements of its induced magnetic field at the position of JUICE.
Betty Pei‐Chun Tsai, Elias Roussos, Ronan Modolo, Mika K. G. Holmberg, Xianzhe Jia, Tom Nordheim, Sachin Alexander Reddy, Norbert Krupp, Markus Fränz, Yasuhito Narita, Christina Plainaki   +10 more
wiley   +1 more source

Visible-infrared Spectra of keV Electron Irradiated Cryogenic Salts with Implications for Europa Surface Composition

The Planetary Science Journal
Visible to near-infrared spectral coloring of cryogenic halides, sulfates, their frozen brines, and sulfuric acid hydrate formed through one to tens of keV electron radiation can inform on the composition of Europa’s surface.
C. A. Hibbitts, K. Stockstill-Cahill, E. Lloyd, E. Gloesener, M. Choukroun, C. Paranicas, R. N. Clark   +6 more
doaj   +1 more source

Origin of Europa and the Galilean Satellites

, 2017
Europa is believed to have formed near the very end of Jupiter's own accretion, within a circumplanetary disk of gas and solid particles. We review the formation of the Galilean satellites in the context of current constraints and understanding of giant planet formation, focusing on recent models of satellite growth within a circumjovian accretion disk
Canup, Robin M., Ward, William R.
openaire   +2 more sources

Motional Induction in Ganymede's Ocean

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract We investigate the magnetic signature of oceanic circulation in Ganymede's subsurface ocean using kinematic induction modeling. Our approach couples zonal jet flows from rotating thermal convection simulations with magnetic field models incorporating Ganymede's internal dynamo and external contributions from Jupiter.
Simon Cabanes, Thomas Gastine, Alexandre Fournier   +2 more
wiley   +1 more source

Europa is Embedded in Non‐Maxwellian, Anisotropic Electron Distributions

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract In September 2022, the Juno spacecraft flew by Europa, providing new insight into the electron pitch angle and energy distributions via the Jovian Auroral Distributions Experiment electron analyzers (JADE‐E). We fit these observations with two anisotropic kappa distributions (cold and hot), accounting for spacecraft potential, which we find to
S. P. Ellis, J. R. Szalay, G. Livadiotis, S. R. Carberry Mogan, F. Allegrini, R. W. Ebert, M. Horányi, D. J. McComas, T. Oberg, Y. Sarkango, A. H. Sulaiman   +10 more
wiley   +1 more source

Callisto’s Nonresonant Orbit as an Outcome of Circum-Jovian Disk Substructure

The Astrophysical Journal
The Galilean moons of Io, Europa, and Ganymede exhibit a 4:2:1 commensurability in their mean motions, a configuration known as the Laplace resonance. The prevailing view for the origin of this three-body resonance involves the convergent migration of ...
Teng Ee Yap, Konstantin Batygin
doaj   +1 more source

Sulfur Implantation into Water Ice with Propane: Implications for Organic Chemistry on the Surface of Europa

The Planetary Science Journal
We performed experiments of implantation of energetic sulfur ions (105 keV) into 2:1 water:propane ices at 80 K and analyzed the resulting refractory organic matter with ultrahigh-resolution mass spectrometry.
Alexis Bouquet, Cíntia Aparecida Pires da Costa, Philippe Boduch, Hermann Rothard, Alicja Domaracka, Grégoire Danger, Isabelle Schmitz, Carlos Afonso, Philippe Schmitt-Kopplin, Vincent Hue, Tom A. Nordheim, Alexander Ruf, Fabrice Duvernay, Maryse Napoleoni, Nozair Khawaja, Frank Postberg, Thomas Javelle, Olivier Mousis, Laura Isabel Tenelanda Osorio   +18 more
doaj   +1 more source