Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Paul V. Johnson"'
Publikováno v:
The Planetary Science Journal, Vol 4, Iss 9, p 178 (2023)
Europa's subsurface ocean is postulated to contain appreciable amounts of Mg ^2+ and ${{\mathrm{SO}}_{4}}^{2-}$ ions, among other species. Recent laboratory experiments have shown that when solutions containing these species freeze to Europa-relevant
Externí odkaz:
https://doaj.org/article/3f292aeff38d48209eb8562758904082
Publikováno v:
The Planetary Science Journal, Vol 4, Iss 8, p 156 (2023)
Saturn’s moon Enceladus harbors a global, subsurface liquid ocean beneath an icy crust that actively erupts water jets from fissures in its south pole. Data returned from the Cassini mission have identified salts and organic matter within these eje
Externí odkaz:
https://doaj.org/article/1d719339d33045108781c510236b92c8
Crystallization Kinetics of Vitreous Magnesium Sulfate Hydrate and Implications for Europa’s Surface
Publikováno v:
The Planetary Science Journal, Vol 4, Iss 1, p 7 (2023)
Brines consistent with that expected for Europa’s global subsurface ocean have been shown to form vitreous salt hydrates when frozen. We report experiments examining the crystallization kinetics of vitreous MgSO _4 hydrate in order to better unders
Externí odkaz:
https://doaj.org/article/8dcf391550584629be25d4ba42058323
Publikováno v:
The European Journal of Finance. :1-32
Publikováno v:
Astrobiology. 20:889-896
This work investigated microorganism survival under temperature and ultraviolet (UV) radiation conditions found at the surface of ice-covered ocean worlds. These studies were motivated by a desire to understand the ability of resilient forms of life
Publikováno v:
ACS Earth and Space Chemistry. 3:2430-2436
Ozone is known to be present within the surface ice of Jupiter’s moon Ganymede as well as Saturn’s moons Dione and Rhea. Given the ubiquity of solar photons incident on these water-ice-dominated su...
Publikováno v:
ACS Earth and Space Chemistry. 3:663-668
The presence of sulfur dioxide on the trailing hemisphere of Europa’s surface is well-established, and both its presence and its chemistry are influenced by sulfur ion implantation. Particle irradi...
Publikováno v:
Icarus. 321:857-865
The global ocean believed to exist beneath Europa's thick ice shell is often cited as one of the most likely places in the solar system to find evidence of extraterrestrial habitable environments or even extant life. However, given the technical chal
Publikováno v:
Icarus. 320:150-158
Prominent bright spots containing natrite (Na2CO3) and smaller amounts of NH4Cl or NH4HCO3 observed in Ceres' Occator crater have been proposed to originate from an internal reservoir, where subsurface brines freeze upon reaching the surface. Our gro
Autor:
Paul V. Johnson, Tuan H. Vu
Publikováno v:
The Planetary Science Journal. 3:151
Technologies are being developed to enable a robotic spacecraft to directly access Europa’s ocean by penetrating its kilometers-thick ice crust. Until such time comes, however, our ability to characterize it will be limited to observations of its e