Research Topics
| S W SquyresSummaryAffiliation: Cornell University Country: USA Publications
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Detail Information
Publications
Ancient impact and aqueous processes at Endeavour Crater, MarsS W Squyres
Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
Science 336:570-6. 2012....- Exploration of Victoria crater by the Mars rover OpportunityS W Squyres
Department of Astronomy, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA
Science 324:1058-61. 2009..Compositional variations with depth mimic those approximately 6 kilometers to the north and demonstrate that water-induced alteration at Meridiani Planum was regional in scope... 
The Spirit Rover's Athena science investigation at Gusev Crater, MarsS W Squyres
Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
Science 305:794-9. 2004..Any lacustrine sediments that may exist at this location within Gusev apparently have been buried by lavas that have undergone subsequent impact disruption...- Detection of silica-rich deposits on MarsS W Squyres
Department of Astronomy, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA
Science 320:1063-7. 2008..This discovery is important for understanding the past habitability of Mars because hydrothermal environments on Earth support thriving microbial ecosystems... - The Opportunity Rover's Athena science investigation at Meridiani Planum, MarsS W Squyres
Department of Astronomy, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA
Science 306:1698-703. 2004..Hematite-rich spherules are embedded in the rock and eroding from them. We interpret these spherules to be concretions formed by postdepositional diagenesis, again involving liquid water... - Two years at Meridiani Planum: results from the Opportunity RoverS W Squyres
Department of Astronomy, Space Sciences Building, Cornell University, Ithaca, NY 14853, USA
Science 313:1403-7. 2006..Observations from microscopic to orbital scales indicate that ancient Meridiani once had abundant acidic groundwater, arid and oxidizing surface conditions, and occasional liquid flow on the surface... - In situ evidence for an ancient aqueous environment at Meridiani Planum, MarsS W Squyres
Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
Science 306:1709-14. 2004..The geologic record at Meridiani Planum suggests that conditions were suitable for biological activity for a period of time in martian history... - Pancam multispectral imaging results from the Opportunity Rover at Meridiani PlanumJ F Bell
Department of Astronomy, Cornell University, Ithaca NY 14853, USA
Science 306:1703-9. 2004..Atmospheric observations show a steady decline in dust opacity during the mission. Astronomical observations captured solar transits by Phobos and Deimos and time-lapse observations of sunsets... - Pancam multispectral imaging results from the Spirit Rover at Gusev CraterJ F Bell
Cornell University, Ithaca, NY 14853 6801, USA
Science 305:800-6. 2004..Atmospheric observations show a steady decline in dust opacity during the mission, and astronomical observations captured solar transits by the martian moons, Phobos and Deimos, as well as a view of Earth from the martian surface... - Chemistry of rocks and soils in Gusev Crater from the alpha particle x-ray spectrometerR Gellert
Max Planck Institut fur Chemie, J J Becher Weg 27, D 55128 Mainz, Germany
Science 305:829-32. 2004..High abundance of bromine (up to 170 parts per million) in rocks may indicate the alteration of surfaces formed during a past period of aqueous activity in Gusev crater... - Distribution of hydrogen in the near surface of Mars: evidence for subsurface ice depositsW V Boynton
Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA
Science 297:81-5. 2002..The hydrogen-rich regions correlate with regions of predicted ice stability. We suggest that the host of the hydrogen in the subsurface layer is ice, which constitutes 35 +/- 15% of the layer by weight... - A closer look at water-related geologic activity on MarsA S McEwen
Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA
Science 317:1706-9. 2007..Thus, we cannot confirm the reality of ancient oceans or water in active gullies but do see evidence of fluvial modification of geologically recent mid-latitude gullies and equatorial impact craters... - Wind-related processes detected by the Spirit Rover at Gusev Crater, MarsR Greeley
Department of Geological Sciences, Arizona State University, Box 871404, Tempe, AZ 85287 1404, USA
Science 305:810-3. 2004..Characteristics of some rocks, such as a two-toned appearance, suggest that they were possibly buried and exhumed on the order of 5 to 60 centimeters by wind deflation, depending on location... - Atmospheric imaging results from the Mars exploration rovers: Spirit and OpportunityM T Lemmon
Texas A and M University, College Station, TX 77843, USA
Science 306:1753-6. 2004..52 +/- 0.18 mm at Meridiani. Comparison of visible optical depths with 9-mm optical depths shows a visible-to-infrared optical depth ratio of 2.0 +/- 0.2 for comparison with previous monitoring of infrared optical depths... - Chemistry of rocks and soils at Meridiani Planum from the Alpha Particle X-ray SpectrometerR Rieder
Max Planck Institut fur Chemie, J J Becher Weg 27, D 55128 Mainz, Germany
Science 306:1746-9. 2004..Rocky outcrops are rich in sulfur and variably enriched in bromine relative to chlorine. The interaction with water in the past is indicated by the chemical features in rocks and soils at this site... - Jarosite and hematite at Meridiani Planum from Opportunity's Mossbauer SpectrometerG Klingelhöfer
Institut fur Anorganische und Analytische Chemie, Johannes Gutenberg Universitat, Staudinger Weg 9, D 55128 Mainz, Germany
Science 306:1740-5. 2004..Bounce rock is probably an impact erratic. Because jarosite is a hydroxide sulfate mineral, its presence at Meridiani Planum is mineralogical evidence for aqueous processes on Mars, probably under acid-sulfate conditions... - Mineralogy at Meridiani Planum from the Mini-TES Experiment on the Opportunity RoverP R Christensen
Department of Geological Sciences, Arizona State University, Tempe, AZ 85287, USA
Science 306:1733-9. 2004..Bright wind streak material matches global dust. Waterlain rocks covered by unaltered basaltic sands suggest a change from an aqueous environment to one dominated by physical weathering... - Localization and physical property experiments conducted by Opportunity at Meridiani PlanumR E Arvidson
Department of Earth and Planetary Sciences, Washington University, St Louis, MO 63130, USA
Science 306:1730-3. 2004..The low mechanical strength of the evaporitic rocks as determined from grinding experiments, and the abundance of coarse-grained surface particles argue for differential erosion of Meridiani Planum... - Evidence from Opportunity's Microscopic Imager for water on Meridiani PlanumK E Herkenhoff
U S Geological Survey Astrogeology Team, Flagstaff, AZ 86001, USA
Science 306:1727-30. 2004..Microscopic images support the hypothesis that hematite-rich spherules observed in outcrops and soils also formed diagenetically as concretions... - Soils of Eagle crater and Meridiani Planum at the Opportunity Rover landing siteL A Soderblom
U S Geological Survey, Flagstaff, AZ 86001, USA
Science 306:1723-6. 2004..The thickness of the soil on the plain is estimated to be about a meter. The flatness and thin cover suggest that the plain may represent the original sedimentary surface... - Localization and physical properties experiments conducted by Spirit at Gusev CraterR E Arvidson
Department of Earth and Planetary Sciences, Washington University, St. Louis, MO 63130, USA
Science 305:821-4. 2004..Volcanic, impact, aeolian, and water-related processes produced the encountered landforms and materials... - Textures of the soils and rocks at Gusev Crater from Spirit's Microscopic ImagerK E Herkenhoff
U S Geological Survey Astrogeology Team, Flagstaff, AZ 86001, USA
Science 305:824-6. 2004..The rock textures are consistent with a volcanic origin and subsequent alteration and/or weathering by impact events, wind, and possibly water... - Magnetic properties experiments on the Mars exploration Rover Spirit at Gusev CraterP Bertelsen
Center for Planetary Science, Danish Space Research Institute and Niels Bohr Institute for Astronomy, Physics and Geophysics, University of Copenhagen, DK 2100 Copenhagen, Denmark
Science 305:827-9. 2004..The most magnetic fraction of the dust appears darker than the average dust. Magnetite was detected in the first two rocks ground by Spirit... - Basaltic rocks analyzed by the Spirit Rover in Gusev CraterH Y McSween
Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996 1410, USA
Science 305:842-5. 2004..Mössbauer, Pancam, and Mini-TES spectra confirm the presence of olivine, magnetite, and probably pyroxene. These basalts extend the known range of rock compositions composing the martian crust... - Initial results from the Mini-TES experiment in Gusev Crater from the Spirit RoverP R Christensen
Department of Geological Sciences, Arizona State University, Tempe, AZ 85287, USA
Science 305:837-42. 2004..Diurnal temperature data indicate particle sizes from 40 to 80 microm in hollows to approximately 0.5 to 3 mm in soils... - Mineralogy at Gusev Crater from the Mössbauer spectrometer on the Spirit RoverR V Morris
NASA Johnson Space Center, Houston, TX, USA
Science 305:833-6. 2004..The ubiquitous presence of olivine in soil suggests that physical rather than chemical weathering processes currently dominate at Gusev crater... - Global distribution of neutrons from Mars: results from Mars odysseyW C Feldman
Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Science 297:75-8. 2002..The central portion of the north polar cap is covered by a thick CO2 layer, as is the residual south polar cap. Portions of the low to middle latitudes indicate subsurface deposits of chemically and/or physically bound H2O and/or OH...