Results 51 to 60 of about 2,936 (194)

The Martian Boulder Automatic Recognition System, MBARS

Earth and Space Science, 2022
Boulder‐sized clasts are common on the surface of Mars, and many are sufficiently large to be resolved by the high resolution imaging science experiment (HiRISE) camera aboard the Mars reconnaissance orbiter. The size, number, and location of boulders on
Don R. Hood, S. F. Sholes, S. Karunatillake, C. I. Fassett, R. C. Ewing, J. Levy   +5 more
doaj   +1 more source

Sulfur Cycling as a Viable Metabolism under Simulated Noachian/Hesperian Chemistries

Life, 2022
Water present on the surface of early Mars (>3.0 Ga) may have been habitable. Characterising analogue environments and investigating the aspects of their microbiome best suited for growth under simulated martian chemical conditions is key to ...
James A. W. Oliver, Matthew Kelbrick, Nisha K. Ramkissoon, Amy Dugdale, Ben P. Stephens, Ezgi Kucukkilic-Stephens, Mark G. Fox-Powell, Susanne P. Schwenzer, André Antunes, Michael C. Macey   +9 more
doaj   +1 more source

A Low‐Power Radioisotope XRF Spectrometer for Detection of Light Elements on Planetary Missions

X-Ray Spectrometry, EarlyView.
ABSTRACT Current X‐ray spectrometers for in situ geochemical analysis on planetary missions typically rely either on X‐ray tubes, which demand electrical power and add mass and thermal complexity, or on alpha particle X‐ray spectrometers (APXS) that use rare 244Cm$$ {}^{244}\mathrm{Cm} $$ sources, and come with severe concerns on radiation safety and ...
Leandro Silveri, Artem Knyazev, Hashem Alaidaros, Maryam Manzoor Amanullah, Zach Ioannou, Tengiz Ibrayev, Danish Khan, Sara Leardini, Laura Manenti, Simi Maria Emilia Mangani, Safa Naseem, Sandhya Sharma, Sara Trevisan, Alia Zino, Francesco Arneodo   +14 more
wiley   +1 more source

Photovoltaics-Driven Power Production Can Support Human Exploration on Mars

Frontiers in Astronomy and Space Sciences, 2022
A central question surrounding possible human exploration of Mars is whether crewed missions can be supported by available technologies using in situ resources.
Anthony J. Abel, Anthony J. Abel, Aaron J. Berliner, Aaron J. Berliner, Mia Mirkovic, Mia Mirkovic, William D. Collins, William D. Collins, Adam P. Arkin, Adam P. Arkin, Adam P. Arkin, Douglas S. Clark, Douglas S. Clark, Douglas S. Clark   +13 more
doaj   +1 more source

Characterization of the Martian Surface Layer [PDF]

Journal of the Atmospheric Sciences, 2009
Abstract The authors have estimated the diurnal evolution of Monin–Obukhov length, friction velocity, temperature scale, surface heat flux, eddy-transfer coefficients for momentum and heat, and turbulent viscous dissipation rate on the Martian surface layer for a complete sol belonging to the Pathfinder mission. All these magnitudes have
Martínez, Germán, Valero Rodríguez, Francisco, Vázquez Martínez, Luis   +2 more
openaire   +3 more sources

Cold comfort for change: Stream mats as biological indicators of ecosystem processes in the McMurdo Dry Valleys, Antarctica

Journal of Phycology, EarlyView.
Abstract Glacier‐fed streams (GFSs) make ideal systems for studying climate‐related changes. Some of the best‐studied GFSs are found in the McMurdo Dry Valleys (MDVs) of Antarctica, one of the Earth's coldest and driest deserts. Despite their harsh and isolated nature, MDV GFSs represent an oasis of life in a landscape visually devoid of it, with ...
Tyler J. Kohler, Ian Hawes, Adrian Howkins, Lydia H. Zeglin, Mike N. Gooseff, Diane M. McKnight   +5 more
wiley   +1 more source

Radiation-induced alteration of apatite on the surface of Mars: first in situ observations with SuperCam Raman onboard Perseverance

Scientific Reports
Planetary exploration relies considerably on mineral characterization to advance our understanding of the solar system, the planets and their evolution.
E. Clavé, O. Beyssac, S. Bernard, C. Royer, G. Lopez-Reyes, S. Schröder, K. Rammelkamp, O. Forni, A. Fau, A. Cousin, J. A. Manrique, A. Ollila, J. M. Madariaga, J. Aramendia, S. K. Sharma, T. Fornaro, S. Maurice, R. C. Wiens, the SuperCam Science team   +18 more
doaj   +1 more source

Petrography and mineral chemistry of Northeast Africa 053—A remnant of Martian crystal mush

Meteoritics &Planetary Science, EarlyView.
Abstract In Earth's igneous systems, crystal mushes, crystal‐rich frameworks permeated by silicate melt, represent a common and fundamental stage in the evolution of magma bodies. However, whether crystal mushes occur within Martian igneous systems and play a comparable role is unknown. Here, we present a comprehensive petrography and mineral chemistry
Xhonatan Shehaj, Eleonora Ammannito, Giovanni Pratesi   +2 more
wiley   +1 more source

Model Calculations for Cosmogenic Nuclides in Meteorites and the Lunar Surface. 1. Long‐lived Radionuclides

Meteoritics &Planetary Science, EarlyView.
Abstract Production rates for the cosmogenic radionuclides 10Be, 14C, 26Al, 36Cl, 41Ca, 53Mn, and 60Fe in a large variety of meteorites, that is, ordinary chondrites (H, L, LL), carbonaceous chondrites, HED meteorites, ureilites, Martian meteorites, and iron meteorites and in the uppermost ~2 m of the lunar surface are modeled.
Ingo Leya
wiley   +1 more source

A new model describing Forbush Decreases at Mars: combining the heliospheric modulation and the atmospheric influence

Earth and Planetary Physics, 2020
Forbush decreases are depressions in the galactic cosmic rays (GCRs) that are caused primarily by modulations of interplanetary coronal mass ejections (ICMEs) but also occasionally by stream/corotating interaction regions (SIRs/CIRs).
Jingnan Guo, Robert F. Wimmer-Schweingruber, Mateja Dumbović, Bernd Heber, YuMing Wang   +4 more
doaj   +1 more source