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  • LUNAR AND PLANETARY EXPLORATION  (6)
  • Lunar and Planetary Science and Exploration  (3)
  • *Water  (1)
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  • 1
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    Planetary science. Enceladus--oasis or ice ball? (2008)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2008-06-17
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kieffer, Susan W -- Jakosky, Bruce M -- New York, N.Y. -- Science. 2008 Jun 13;320(5882):1432-3. doi: 10.1126/science.1159702.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology, University of Illinois, Urbana, IL 61802, USA. skieffer@uiuc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18556539" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Carbon ; Elements ; *Exobiology ; Extraterrestrial Environment ; Hydrogen ; Ice ; *Life ; Nitrogen ; Oxygen ; *Saturn ; *Solar System ; Temperature ; *Water
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    A close-up look at Io from Galileo's near-infrared mapping spectrometer (2000)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Infrared spectral images of Jupiter's volcanic moon Io, acquired during the October and November 1999 and February 2000 flybys of the Galileo spacecraft, were used to study the thermal structure and sulfur dioxide distribution of active volcanoes. Loki Patera, the solar system's most powerful known volcano, exhibits large expanses of dark, cooling lava on its caldera floor. Prometheus, the site of long-lived plume activity, has two major areas of thermal emission, which support ideas of plume migration. Sulfur dioxide deposits were mapped at local scales and show a more complex relationship to surface colors than previously thought, indicating the presence of other sulfur compounds.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Science (ISSN 0036-8075); Volume 288; 5469; 1201-4
    Format: text
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  • 3
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    Triton's geyser-like plumes - Discovery and basic characterization (1990)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: One model for the mechanism driving the plumes of the four active geyser-like eruptions observed by Voyager 2 on Triton is a heating up of nitrogen ice in a subsurface greenhouse environment, where nitrogen gas pressurized by solar heating explosively vents to the surface carrying clouds of ice and dark particles into the atmosphere. A temperature increase of less than 4 K above the ambient surface value of 38 + or - 3 K suffices to drive the plumes to 8-km altitude. Each eruption may last a year or more, over the course of which 0.1 cu km of ice is sublimed.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Science (ISSN 0036-8075); 250; 410-415
    Format: text
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  • 4
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    A Close-Up View of Io in the Infrared: NIMS Results from the Galileo Fly-Bys (2000)
    In:  Other Sources
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    Publikationsdatum: 2017-10-02
    Beschreibung: We report the initial results obtained by the Galileo Near-Infrared Mapping Spectrometer during the fly-bys of Io. Our data reveals, for the first time, the detailed thermal structure of hot spots and the local distribution of SO2 frost.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Lunar and Planetary Science XXXI; LPI-Contrib-1000
    Format: text
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  • 5
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    Low-velocity impact craters in ice and ice-saturated sand with implications for Martian crater count ages (1979)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: The paper reports on a series of low-velocity impact experiments performed in ice and ice-saturated sand. It is found that crater diameters in ice-saturated sand were about 2 times larger than in the same energy and velocity range in competent blocks of granite, basalt and cement, while craters in ice were 3 times larger. It is shown that if this dependence of crater size on strength persists to large hypervelocity impact craters, then surface of geologic units composed of ice or ice-saturated soil would have greater crater count ages than rocky surfaces with identical influx histories. Among the conclusions are that Martian impact crater energy versus diameter scaling may also be a function of latitude.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Journal of Geophysical Research; 84; Dec. 30
    Format: text
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  • 6
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    The role of volatiles and lithology in the impact cratering process (1980)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: A survey of published descriptions of 32 of the largest, least eroded terrestrial impact structures shows that the amount of melt at craters in crystalline rocks is approximately two orders of magnitude greater than that at craters in sedimentary rocks. A model is proposed for the impact process, and it is examined whether the difference in melt abundance is due to differences in the amount of melt generated in various target materials or due to differences in the fate of the melt during late stages of the impact. The model accounts semiquantitatively for the effects of porosity and water and volatile content on the cratering process. Important features of the model are noted. Even if the recondensation of released volatiles is very efficient, the cumulative effect of repeated impacts on accreting planets would be to continually transfer volatiles toward the outer surface. By this process, volatiles might be enriched toward the outer layer of a growing planet.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Reviews of Geophysics and Space Physics; 18; Feb. 198
    Format: text
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  • 7
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    A constraint on impact theories of chondrule formation (1977)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: The association between agglutinates and chondrule-like spherules, which characterizes the assemblage of impact-derived melt products in lunar regolith samples and some gas-rich achondrites, is not found in primitive chondrites. This observation suggests that impacts into a parent-body regolith are unlikely to have produced the chondrules. We believe that if chondrules were formed from impact melt, it was probably generated by jetting during particle-to-particle collisions, presumably in the nebula.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Earth and Planetary Science Letters; 35; 1, Ma; May 1977
    Format: text
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  • 8
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    From regolith to rock by shock (1975)
    In:  Other Sources
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    Publikationsdatum: 2019-06-27
    Beschreibung: The purpose of this study is to relate the various mechanisms by which material is shock-lithified in terrestrial analogs of the lunar regolith to specific conditions of cratering, thereby making more specific the possible conditions of formation of rock from regolith by shock processes on the lunar surface. A model for shock-lithification of terrestrial and lunar regolith is proposed in which air or an air-water mixture initially in the pores of terrestrial soil affects the behavior of a soil-air-water system under shock-loading. Shock compression of porous terrestrial regolith by relatively small impact events give rise to three pressure regimes: (1) regime 1 - at pressures below 100 kb, material is compacted and weakly shock-lithified; (2) regime 2 - at pressures between 100 and 200 kb, material may be fragmented if the induced pore pressure exceeds the strength of the weak lithification mechanisms; and (3) at pressure above 200 kb, material is strongly lithified but may greatly expand in volume due to the pressure of pore gases. The three other regimes (below 50 kb, between 50 and 100 kb, and above 100 kb) associated with shock compression of lunar regolith are identified and discussed.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Format: text
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  • 9
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    Impact conditions required for formation of melt by jetting in silicates (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: It is demonstrated that the process of jetting which occurs when particles collide at oblique angles may produce melt at much lower velocities than are required for melt production in head-on collisions. The minimum velocities of impact required for jetting in aluminum, bronzitite, dunite, and quartz are calculated by the method of shock polars. The analysis, which depends on stated assumptions about attained pressures and the occurrence of jetting, uses shock-velocity particle-velocity equations of state with three shock regimes. The treatment indicates that jetting should arise in bronzitite, dunite, and quartz at relative velocities as low as 1-2 km/sec. At such velocities material which passes near the stagnation point in the jet-forming region is subjected to sufficiently high pressures so that it is probably melted.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Symposium on Planetary Cratering Mechanics; Sep 13, 1976 - Sep 17, 1976; Flagstaff, AZ
    Format: text
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  • 10
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    Plume Models and Pyroclastic Flow on Io (2001)
    In:  Other Sources
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    Publikationsdatum: 2019-08-15
    Beschreibung: Models of Io's plumes have been run varying atmospheric pressure, vent size, and volatile content. These simulations suggest that eruptions with low volatile content can form pyroclastic flows on Io. Additional information is contained in the original extended abstract.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Lunar and Planetary Science XXXII; LPI-Contrib-1080
    Format: text
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