Results 31 to 40 of about 261 (167)

Reproducing Ganymede's Craters With the Melosh Model of Acoustic Fluidization

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract An impact event excavates a bowl‐shaped transient cavity, which subsequently collapses under gravity. For larger cavities, gravitational forces exceed the strength of the target material beneath the cavity, resulting in central uplift and a reduced final depth‐to‐diameter ratio (≤ ${\le} $1/10).
Sowon Lee, B. C. Johnson
wiley   +1 more source

Interactions of Sublimated Frost With Volcanic Plumes: Modeling Io's SO2 Atmosphere Using the DSMC Method

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract Io's tenuous atmosphere consists primarily of sulfur dioxide (SO2 ${\text{SO}}_{2}$) with observed column densities of approximately 1016−1017 $1{0}^{16}-1{0}^{17}$ cm−2 ${\text{cm}}^{-2}$. However, it remains uncertain whether the sublimation of SO2 ${\text{SO}}_{2}$ surface frost or volcanic outgassing is the primary source of the SO2 ...
Leander Schlarmann, Audrey Vorburger, Tim Mosimann, Nicolas Thomas, Peter Wurz   +4 more
wiley   +1 more source

Europa’s Sodium and Potassium Exosphere during Juno’s Flyby

The Planetary Science Journal
Jupiter’s icy moon Europa is enveloped in gaseous sodium and potassium that resonantly scatter sunlight as optical emission lines. The High Resolution Echelle Spectrograph on the Keck I telescope has spatially mapped these alkalis contemporaneously with ...
Emma Lovett, Carl Schmidt, Patrick Lierle   +2 more
doaj   +1 more source

What Is Space Bioethics?

Bioethics, Volume 40, Issue 6, Page 558-564, July 2026.
ABSTRACT Classical bioethics examines moral issues in terrestrial medicine and the life sciences. According to Konrad Szocik, space bioethics merely relocates those questions to harsher environments. We argue that this view is incomplete: space bioethics is a genuinely original domain.
Maurizio Balistreri
wiley   +1 more source

Surface Changes on Io Observed by Large Binocular Telescope/SHARK in Early 2025

The Planetary Science Journal
High spatial resolution images of the volcanic moon Io at visible and near-infrared wavelengths were obtained by the SHARK-VIS and SHARK-NIR instruments on the Large Binocular Telescope on UT 2025 February 18 and 23.
Ashley Gerard Davies, Gianluca Li Causi, Jason E. Perry, Stuart M. Jefferies, Fernando Pedichini, Dino Mesa, David A. Williams, Imke de Pater, David M. Nelson, Fabien R. Baron, Albert R. Conrad, Katherine de Kleer, Simone Antoniucci, Douglas Hope, Maria Bergomi, Francesco D’Alessio, Simone Filomeno, Tania S. Gomes Machado, Fulvio Laudisio, Luca Marafatto, Ester Marini, Roberto Piazzesi, Davide Ricci, Vincenzo Testa, Piero Vaccari, Daniele Vassallo   +25 more
doaj   +1 more source

Clues to the Origin of Jovian Outer Irregular Satellites from Reflectance Spectra

The Planetary Science Journal
Visible/near-infrared narrowband spectroscopy (dispersion per element ∼ 6 Å) was obtained of the Jovian irregular satellites JVI Himalia, JVII Elara, JVIII Pasiphae, JIX Sinope, JX Lysithea, JXI Carme, JXII Ananke, and JXVII Callirrhoe in 2006, 2009, and
Faith Vilas, Amanda R. Hendrix
doaj   +1 more source

Jupiter’s Metastable Companions

The Astrophysical Journal Letters
Jovian co-orbitals share Jupiter’s orbit and exhibit 1:1 mean-motion resonance with the planet. This includes >10,000 so-called Trojan asteroids surrounding the leading (L4) and trailing (L5) Lagrange points, viewed as stable groups dating back to planet
Sarah Greenstreet, Brett Gladman, Mario Jurić   +2 more
doaj   +1 more source

Inter‐Orbit Variability of Jupiter's Current Sheet Morphology

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract The structure of Jupiter's magnetosphere reflects the combined effects of a strong intrinsic field and an extended hinged current sheet whose morphology varies with solar wind forcing. We present a study of Jupiter's magnetodisc that combines the UCL‐AGA magnetodisc code with Khurana's generalized, hinged current sheet models (1992/2022) to ...
A. Santos, N. Achilleos, D. Millas, P. Guio, W. Dunn, G. Provan, J. D. Nichols, C. S. Arridge   +7 more
wiley   +1 more source

A Constraint on the Density of Jupiter’s Moon Thebe from Primordial Dynamics

The Astrophysical Journal Letters
Of the 97 known satellites in the Jovian system, the individual masses and densities of each moon have only been determined for six of them: the four Galileans, Amalthea, and Himalia. In this Letter, we derive a prediction for the mean density (and mass)
Ian R. Brunton, Konstantin Batygin
doaj   +1 more source

Temporal Variability of Saturn's H2 Dayglow and Northern Aurora Observed by Hisaki and Cassini

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Ultraviolet (UV) emissions from molecular hydrogen in Saturn's atmosphere consist of bright auroral emission over the poles and disk‐wide airglow. The dayside disk emits substantial intensities (dayglow) previously detected by various instruments.
L. S. Clare, S. V. Badman, T. Kimura, F. Tsuchiya, H. Tadokoro, C. Tao, Y. Kasaba, A. Bader, S. W. Farr, J. Kinrade, K. Yoshioka, A. Yamazaki, G. Murakami, I. Yoshikawa, H. Kita   +14 more
wiley   +1 more source