 | | Journal (article/letter/editorial) | | Age constraints of Mercury’s polar deposits suggest recent delivery of ice Ariel N. Deutsch a,∗ , James...Keywords: Mercury ice polar deposits ages Moon a b s t r a c t Surface ice at the poles of Mercury appears...water. We provide new age estimates of the surfaces of Mercury’s polar deposits from combined analyses of...regions imaged by the MESSENGER spacecraft. These age estimates conservatively suggest that ice was delivered...to Mercury within the last ∼330 Myr. The geologically young ages suggest that the surfaces have been |  | Qiao, Le, Ling, Zongcheng, Head, James W., Ivanov, Mikhail A., Liu, Bin (2019) Analyses of Lunar Orbiter Laser Altimeter 1,064‐nm Albedo in Permanently Shadowed Regions of Polar Crater Flat Floors: Implications for Surface Water Ice Occurrence and Future In Situ Exploration. Earth and Space Science, 6 (3). 467-488 doi:10.1029/2019ea000567 | Journal (article/letter/editorial) | | (PSRs) on flat floors of polar crater have systematically higher 1,064‐nm albedo than the adjacent terrains...surface water ice, not other factors, serves as the most plausible explanation for the elevated 1, 064‐nm...064‐nm albedo of these PSRs • The inferred PSR water ice exposures are in very small quantity and laterally...laterally heterogeneous in model water ice abundance Supporting Information: • Supporting Information S1...permanently shadowed regions of polar crater flat floors: Implications for surface water ice occurrence and future |  | Deutsch, Ariel N., Chabot, Nancy L., Mazarico, Erwan, Ernst, Carolyn M., Head, James W., Neumann, Gregory A., Solomon, Sean C. (2016) Comparison of areas in shadow from imaging and altimetry in the north polar region of Mercury and implications for polar ice deposits. Icarus, 280. 158-171 doi:10.1016/j.icarus.2016.06.015 | Journal (article/letter/editorial) | | imaging and altimetry in the north polar region of Mercury and implications for polar ice deposits Ariel N....Sciences, Brown University, Providence, RI 02912, USA The Johns Hopkins University Applied Physics Laboratory...Earth-based radar observations and results from the MESSENGER mission have provided strong evidence that...regions near Mercury’s poles host deposits of water ice. MESSENGER’s complete orbital image and topographic...illumination conditions. The shadowed regions of Mercury’s north polar region from 65°N to 90°N were mapped |  | Delitsky, M.L., Paige, D.A., Siegler, M.A., Harju, E.R., Schriver, D., Johnson, R.E., Travnicek, P. (2017) Ices on Mercury: Chemistry of volatiles in permanently cold areas of Mercury's north polar region. Icarus, 281. 19-31 doi:10.1016/j.icarus.2016.08.006 | Journal (article/letter/editorial) | | volatiles in permanently cold areas of Mercury’s north polar region M.L. Delitsky a,∗, D.A. Paige b, M.A. Siegler...magnetospheres radiolysis a b s t r a c t Observations by the MESSENGER spacecraft during its flyby and orbital...observations of Mercury in 2008– 2015 indicated the presence of cold icy materials hiding in permanently-shadowed...Mercury’s north polar region. These icy condensed volatiles are thought to be composed of water ice and frozen...timescales and evolve under the influence of the Mercury space environment. Polar ices never see solar photons |  | | Journal (article/letter/editorial) | | 1038/s41561-019-0405-8 Thick ice deposits in shallow simple craters on the Moon and Mercury Lior Rubanenko...shadowed regions near the poles of Mercury and the Moon may cold-trap water ice for geologic time periods...past studies, thick ice deposits have been detected on Mercury, but not on the Moon, despite their similar...for thick ice deposits inside permanently shadowed simple craters on both Mercury and the Moon. We measure...measure the depth/diameter ratio of approximately 2,000 simple craters near the north pole of Mercury using |  | | Journal (article/letter/editorial) | | Band 224. Nr. 5374. 22. Temperature estimates of the planet Mars. By W. W. Cobdentz. Contents. I. Introduction...temperatures derived from the law of total radiation. 2. Planetary temperatures derived from the law of spectral...comparison with the Moon. 4. Planetary temperatures inferred from comparisons with the earth. 5 . Comparison...Climatic conditions on Mars. I . Average temperature of the whole disk. 2. Radiation from and temperatures of...equatorial regions. b) East and west limbs. c) North and south polar regions. 3. Seasonal variation of temperatures |  | Strahan, Dr., Beaumont, Lewis, Harrison, Alfred H., Feilden, Colonel, Darwin, Major (1909) Proposed Sledge Expedition across the North Polar Region: Discussion. The Geographical Journal, 33 (6) 692 doi:10.2307/1777557 | Journal (article/letter/editorial) | | Proposed Sledge Expedition across the North Polar Region: Discussion Author(s): Dr. Strahan, Lewis Beaumont...Harrison, Colonel Feilden and Major Darwin Source: The Geographical Journal, Vol. 33, No. 6 (Jun., 1909)...26-06-2016 14:17 UTC Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use...contact support@jstor.org. Wiley, The Royal Geographical Society (with the Institute of British Geographers)...JSTOR to digitize, preserve and extend access to The Geographical Journal This content downloaded from |  | | Journal (article/letter/editorial) | | com/locate/icarus Regolith properties in the south polar region of the Moon from 70-cm radar polarimetry Bruce...online 10 November 2005 Abstract The south polar region of the Moon contains areas permanently shadowed...for volatiles such as water ice. Previous radar studies have emphasized the search for diagnostic polarization...polarization signatures of thick ice in areas close to the pole, but near-surface regolith properties and...are also important to upcoming orbital studies of the shadowed terrain. To study regional regolith variations |  | | Journal (article/letter/editorial) | | Identification of surface hydrogen enhancements within the Moon’s Shackleton crater Richard S. Miller a,⇑, David...2014 Available online 14 February 2014 Keywords: Moon Moon, surface Ices Gamma ray spectroscopy a b s t...within the Moon’s Shackleton crater. Using an analysis of fast and epithermal neutron data from the Lunar...Lunar Prospector mission, the permanently shadowed region (PSR) within this crater has a surface concentration...In contrast, hydrogen enhancements within other polar PSRs such as Cabeus are likely buried under more |  | | Journal (issue) | | The Volume XXVIII Number 2 March/April 2008 Visions of Exploration From The Editor W e like to...to look back at the time of Apollo and remember how, for a brief moment, the people of Earth pulled together...on the Moon. Memories can be faulty. Opinion polls taken at that time repeatedly showed that the public...public was never solidly behind the space program. Among political leaders, scientists, and engineers, there...was never consensus on the right path to take. Books were written chronicling the decisions, from John |  | | Journal (article/letter/editorial) | | reproducing mobility trends and slide morphologies • The presence of more Type 1 landslides at high latitudes...provide robust information regarding ice content and composition of the subsurface Correspondence to: B....of long runout landslides with more slides near the poles. Here we simulate these landslides using a...landslides on Ceres do not require the presence of fluid or slippery ice to explain their mobility. We find...slide mobility while the relatively low surface gravity of Ceres, compared to the Earth and Mars, reduces |  | Mitchell, Julie, Lawrence, Samuel, Robinson, Mark, Speyerer, Emerson, Denevi, Brett (2018) Using complementary remote sensing techniques to assess the presence of volatiles at the lunar north pole. Planetary and Space Science, 162. 133-147 doi:10.1016/j.pss.2017.07.015 | Journal (article/letter/editorial) | | sensing techniques to assess the presence of volatiles at the lunar north pole Julie Mitchell, Samuel...sensing techniques to assess the presence of volatiles at the lunar north pole, Planetary and Space Science...version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting...note that during the production process errors may be discovered which could affect the content, and all...all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT 1 Using Complementary |  | Kite, Edwin S., Matsuyama, Isamu, Manga, Michael, Perron, J. Taylor, Mitrovica, Jerry X. (2009) True Polar Wander driven by late-stage volcanism and the distribution of paleopolar deposits on Mars. Earth and Planetary Science Letters, 280 (1) 254-267 doi:10.1016/j.epsl.2009.01.040 | Journal (article/letter/editorial) | | c a t e / e p s l True Polar Wander driven by late-stage volcanism and the distribution of paleopolar...Keywords: Mars True Polar Wander Hesperian Amazonian volcanism ice-sheets a b s t r a c t The areal centroids...centroids of the youngest polar deposits on Mars are offset from those of adjacent paleopolar deposits by 5–10°...test the hypothesis that the offset is the result of True Polar Wander (TPW), the motion of the solid...surface with respect to the spin axis, caused by a mass redistribution within or on the surface of Mars. In |  | Berezhnoy, A.A., Hasebe, N., Kobayashi, M., Michael, G.G., Okudaira, O., Yamashita, N. (2005) A three end-member model for petrologic analysis of lunar prospector gamma-ray spectrometer data. Planetary and Space Science, 53 (11) 1097-1108 doi:10.1016/j.pss.2005.02.006 | Journal (article/letter/editorial) | | petrologic maps of the Moon show that Mg-rich rocks are located in Mare Frigoris, the South Pole Aitken...existence of Ca-rich, Al-low small-area anomalies in the farside highlands. An Mg–Th–Fe petrologic technique...2005 Elsevier Ltd. All rights reserved. Keywords: Moon; Gamma-ray spectroscopy; Petrologic mapping; Mg-rich...Mg-rich rocks 1. Introduction Elemental mapping of the Moon is very important for a better understanding of...formation and its evolutional history. Elemental maps of the Moon’s surface make it possible to identify different |  | | Journal (article/letter/editorial) | | investigation of Martian northern high-latitude and polar impact crater interiors: Atypical interior topographic...high-latitude and polar impact craters (NPICs) to better understand the north polar materials and polar processes...southern high-latitude and polar impact craters (SPICs). We find that the NPIC population above 57 N...significantly shallower than the global crater population. This suggests that the NPICs (1) were initially...properties of polar geologic units; (2) were once deeper, but have been infilled due to polar processes; |  | | Journal (article/letter/editorial) | | The Poles of the Moon Paul G. Lucey* 1811-5209/08/0005-0041$2.50 T DOI: 10.2113/gselements.5.1.41...planetary science. Because of the very small tilt of the Moon’s axis with respect to the Sun, craters and other...other depressions near the poles are permanently shaded from direct sunlight. As a consequence, these surfaces...sequestering volatiles from the Moon and elsewhere. Most popular attention has focused on the possible presence...presence of water ice that might be used by astronauts in the future, but the poles may offer a unique scientific |  | | Journal (article/letter/editorial) | | print.) A N I N C E S R E 11:24 D V A The Lakes and Seas of Titan Alexander G. Hayes Annu...Rev. Earth Planet. Sci. 2016. 44:57–83 Keywords The Annual Review of Earth and Planetary Sciences is...on Earth, the volume of liquid exposed on Titan’s surface is only a small fraction of the atmospheric...atmospheric reservoir. The volume and bulk composition of the seas can constrain the age and nature of atmospheric...reservoirs. Similarly, the morphology of lacustrine basins chronicles the history of the polar landscape over |  | Lawrence, David J., Peplowski, Patrick N., Prettyman, Thomas H., Feldman, William C., Bazell, David, Mittlefehldt, David W., Reedy, Robert C., Yamashita, Naoyuki (2013) Constraints on Vesta's elemental composition: Fast neutron measurements by Dawn's gamma ray and neutron detector. Meteoritics & Planetary Science, 48 (11) 2271-2288 doi:10.1111/maps.12187 | Journal (article/letter/editorial) | | MITTLEFEHLDT3, Robert C. REEDY2, and Naoyuki YAMASHITA2 1 The Johns Hopkins University Applied Physics Laboratory...fast neutron data collected by the gamma ray and neutron detector on the Dawn spacecraft. After correcting...additional compositional evidence that Vesta is the parent body to HED meteorites. A subset of fast neutron...hydrogen concentrations across Vesta and supports the idea that Vesta’s hydrogen is due to long-term delivery...INTRODUCTION One of the major objectives of NASA’s Dawn at Vesta mission is to probe the relationship between |  | Lemelin, Myriam, Blair, David M., Roberts, Carolyn E., Runyon, Kirby D., Nowka, Daniela, Kring, David A. (2014) High-priority lunar landing sites for in situ and sample return studies of polar volatiles. Planetary and Space Science, 101. 149-161 doi:10.1016/j.pss.2014.07.002 | Journal (article/letter/editorial) | | sites for in situ and sample return studies of polar volatiles Myriam Lemelin a,n, David M. Blair b,...July 2014 Our understanding of the Moon has advanced greatly over the last several decades thanks to...that the lunar poles may be much more enriched in H2O and other volatile chemical species than the equatorial...equatorial regions sampled during the Apollo missions. The equatorial regions sampled, themselves, contain...mission to a polar region is therefore of great interest; it could provide a measure of the sources and |  | | Journal (article/letter/editorial) | | Jonathan I. Lunine1 The methane-based hydrologic cycle on Saturn’s largest moon, Titan, is an extreme...analogue to Earth’s water cycle. Titan is the only planetary body in the Solar System, other than Earth, that...nitrogen-based atmosphere and flow as liquids on the moon’s surface. Exchange processes between atmospheric...counterparts. Over its 13-year exploration of the Saturn system, the Cassini–Huygens mission revealed that Titan’s...convective storm. In this Review Article, we describe the dominant exchange processes that operate over these |  | TANAKA, K, RODRIGUEZ, J, SKINNERJR, J, BOURKE, M, FORTEZZO, C, HERKENHOFF, K, KOLB, E, OKUBO, C (2008) North polar region of Mars: Advances in stratigraphy, structure, and erosional modification. Icarus, 196 (2). 318-358 doi:10.1016/j.icarus.2008.01.021 | Journal (article/letter/editorial) | | (2008) 318–358 www.elsevier.com/locate/icarus North polar region of Mars: Advances in stratigraphy, structure...We have remapped the geology of the north polar plateau on Mars, Planum Boreum, and the surrounding plains...thematic maps resulting from observations made by the Mars Global Surveyor, Mars Odyssey, Mars Express...assist with effectively discussing the various features of this region. We identify 7 geologic units making...least 3 for the circumpolar plains, which collectively span the entire Amazonian Period. The Planum Boreum |  | | Journal (article/letter/editorial) | | and MOC observations of the atmosphere and surface cap in the north polar region of Mars Bruce A. Cantor...Available online 6 February 2010 Keywords: Mars Mars, Polar caps Mars, Atmosphere a b s t r a c t We used MGS–MOC...MGS–MOC and MRO–MARCI daily mapping images of the North Polar Region of Mars from 16 August 2005 (Ls = 270°)...29), to observe the seasonal behavior of the polar ice cap and atmospheric phenomena. The rate of cap regression...in MY 29. The spatial and temporal behaviors of dust and condensate clouds were similar in the two years |  | Massé, M., Bourgeois, O., Le Mouélic, S., Verpoorter, C., Spiga, A., Le Deit, L. (2012) Wide distribution and glacial origin of polar gypsum on Mars. Earth and Planetary Science Letters, 317. 44-55 doi:10.1016/j.epsl.2011.11.035 | Journal (article/letter/editorial) | | com/locate/epsl Wide distribution and glacial origin of polar gypsum on Mars M. Massé a, b,⁎, O. Bourgeois a,...Spohn Keywords: Mars polar caps sulfates weathering a b s t r a c t The North Polar Cap of Mars is associated...including the Circumpolar Dune Field, interior dune fields and sedimentary veneers scattered over the ice cap...cap. In order to resolve the mineralogical composition and the regional distribution of these sediments...sedimentary veneers covering the North Polar Cap, interior dune fields and the whole Circumpolar Dune Field |  | | Journal (article/letter/editorial) | | com/locate/icarus Present-day erosion rate of north polar scarps on Mars due to active mass wasting L.... A B S T R A C T At the margins of the north polar deposits of dusty water ice on Mars, steep scarps...a record of the planet’s recent climate changes. Some of these scarps are currently the most active places...and block falls. We estimated the erosion rate of a steep north polar scarp by automatically identifying...blocks throughout a time series of HiRISE images. The total depositional volume over three Mars years corresponds |  | Rhoden, Alyssa Rose, Hurford, Terry A., Spitale, Joseph, Henning, Wade, Huff, Eric M., Bland, Michael T., Sajous, Stan (2020) The formation of Enceladus' Tiger Stripe Fractures from eccentricity tides. Earth and Planetary Science Letters, 544. 116389pp. doi:10.1016/j.epsl.2020.116389 | Journal (article/letter/editorial) | | Planetary Science Letters www.elsevier.com/locate/epsl The formation of Enceladus’ Tiger Stripe Fractures from...Enceladus has a young, tectonically active south polar region, which is erupting material from a prominent...observed at the north pole, which is heavily cratered with limited tectonism. Given the many lines of...shell, the reason for the dichotomy in geologic activity is unclear. We model the formation of the Tiger...tidally-driven fractures and examine the magnitudes of tidal stresses with different ice shell structures in order |
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