Observations by the Mars Science Laboratory Mast Camera (Mastcam) in Gale crater reveal isolated outcrops of cemented pebbles (2 to 40 millimeters in diameter) and sand grains with textures typical of fluvial sedimentary conglomerates. Rounded pebbles in the conglomerates indicate substantial fluvial abrasion. ChemCam emission spectra at one outcrop show a predominantly feldspathic composition, consistent with minimal aqueous alteration of sediments. Sediment was mobilized in ancient water flows that likely exceeded the threshold conditions (depth 0.03 to 0.9 meter, average velocity 0.20 to 0.75 meter per second) required to transport the pebbles. Climate conditions at the time sediment was transported must have differed substantially from the cold, hyper-arid modern environment to permit aqueous flows across several kilometers.

https://science.sciencemag.org/content/sci/340/6136/1068.full.pdf

Martian Fluvial Conglomerates at Gale Crater

The global shape, density and rotation of Comet 67P/Churyumov-Gerasimenko from preperihelion Rosetta/OSIRIS observations

There is growing interest in the possibility that the resource base of the Solar System might in future be used to supplement the economic resources of our own planet. As the Earth’s closest celestial neighbour, the Moon is sure to feature prominently in these developments. In this paper I review what is currently known about economically exploitable resources on the Moon, while also stressing the need for continued lunar exploration. I find that, although it is difficult to identify any single lunar resource that will be sufficiently valuable to drive a lunar resource extraction industry on its own (notwithstanding claims sometimes made for the 3He isotope, which are found to be exaggerated), the Moon nevertheless does possess abundant raw materials that are of potential economic interest. These are relevant to a hierarchy of future applications, beginning with the use of lunar materials to facilitate human activities on the Moon itself, and progressing to the use of lunar resources to underpin a future industrial capability within the Earth-Moon system. In this way, gradually increasing access to lunar resources may help ‘bootstrap’ a space-based economy from which the world economy, and possibly also the world’s environment, will ultimately benefit.

/pdf/lunar-resources-a-review-2fvo16x1oc.pdf

Lunar resources A review

We analyze the complete set of in-situ meteorological data obtained from the Viking landers in the 1970s to today’s Curiosity rover to review our understanding of the modern near-surface climate of Mars, with focus on the dust, CO2 and H2O cycles and their impact on the radiative and thermodynamic conditions near the surface. In particular, we provide values of the highest confidence possible for atmospheric opacity, atmospheric pressure, near-surface air temperature, ground temperature, near-surface wind speed and direction, and near-surface air relative humidity and water vapor content. Then, we study the diurnal, seasonal and interannual variability of these quantities over a span of more than twenty Martian years. Finally, we propose measurements to improve our understanding of the Martian dust and H2O cycles, and discuss the potential for liquid water formation under Mars’ present day conditions and its implications for future Mars missions. Understanding the modern Martian climate is important to determine if Mars could have the conditions to support life and to prepare for future human exploration.

/pdf/the-modern-near-surface-martian-climate-a-review-of-in-situ-3ulxijkq5i.pdf

The Modern Near-Surface Martian Climate: A Review of In-situ Meteorological Data from Viking to Curiosity

The selection of Gale crater as the Mars Science Laboratory landing site took over five years, involved broad participation of the science community via five open workshops, and narrowed an initial >50 sites (25 by 20 km) to four finalists (Eberswalde, Gale, Holden and Mawrth) based on science and safety. Engineering constraints important to the selection included: (1) latitude (±30°) for thermal management of the rover and instruments, (2) elevation (< −1 km) for sufficient atmosphere to slow the spacecraft, (3) relief of <100–130 m at baselines of 1–1000 m for control authority and sufficient fuel during powered descent, (4) slopes of <30° at baselines of 2–5 m for rover stability at touchdown, (5) moderate rock abundance to avoid impacting the belly pan during touchdown, and (6) a radar-reflective, load-bearing, and trafficable surface that is safe for landing and roving and not dominated
by fine-grained dust. Science criteria important for the selection include the ability to assess past habitable environments, which include diversity, context, and biosignature (including organics) preservation. Sites were evaluated in detail using targeted data from instruments
on all active orbiters, and especially Mars Reconnaissance Orbiter. All of the final four sites have layered sedimentary rocks with spectral evidence for phyllosilicates that clearly address the science objectives of the mission. Sophisticated entry, descent and landing simulations that include detailed information on all of the engineering constraints indicate all of the final four sites are safe for landing. Evaluation of the traversabilty of the landing sites and target “go to” areas outside of the ellipse using slope and material properties information indicates that all are trafficable and “go to” sites can be accessed within the lifetime of the mission. In the final selection, Gale crater was favored over Eberswalde based on its greater diversity and potential habitability.

Selection of the Mars Science Laboratory Landing Site

Lunar and Planetary Science Conference

American Astronomical Society Meeting Abstracts

Organic compounds that survive in uncommon space environments are an important astrobiology focus. The ORganics Exposure in Orbit (OREOcube) experiment will investigate, in real time, chemical changes in organic compounds exposed to low Earth orbit radiation conditions on an International Space Station (ISS) external platform. OREOcube is packaged as an identical pair of 10-cm cube instruments, each weighing <2 kg and containing a highly capable UV-Visible-NIR spectrometer, a 24-sample carousel, and integral optics enabling use of the Sun as light source for spectroscopy, along with the electronics, microcontroller, and data storage to make each cube an autonomous stand-alone instrument package requiring only a standard power and data interface. We have characterized the influence of mineralogically relevant inorganic materials on the stability, modification, and degradation of the organic molecules under ground laboratory experimental conditions. The results of our laboratory experiments will be used as the basis for the selection of samples for further investigations on the OREOcube ISS experiment. OREOcube is an international collaboration between the European Space Agency, the National Aeronautics and Space Administration, and University partners.

Preliminary studies for the ORganics Exposure in Orbit (OREOcube) Experiment on the International Space Station

The OREOcube (ORganics Exposure in Orbit cube) experiment on the International Space Station (ISS) will investigate the e!ects of solar and cosmic radiation on organic thin "lms supported on inorganic substrates. Probing the kinetics of structural changes and photomodulated organic # inorganic interactions with real-time in situ UV #visible spectroscopy, this experiment will investigate the role played by solid mineral surfaces in the (photo)chemical evolution, transport, and distribution of organics in our solar system and beyond. In preparation for the OREOcube ISS experiment, we report here laboratory measurements of the photostability of thin "lms of the 9,10-anthraquinone derivative anthraru "n (51 nm thick) layered upon ultrathin "lms of iron oxides magnetite and hematite (4 nm thick), as well as supported directly on fused silica. During irradiation with UV and visible light simulating the photon #ux and spectral distribution on the surface of Mars, anthraru "n/iron oxide bilayer thin "lms were exposed to CO 2 (800 Pa), the main constituent (and pressure) of the martian atmosphere. The time-dependent photodegradation of anthraru "n thin "lms revealed the inhibition of degradation by both types of underlying iron oxides relative to anthraru "n on bare fused silica. Interactions between the organic and inorganic thin "lms, apparent in spectral shifts of the anthraru "n bands, are consistent with presumed free-electron quenching of semiquinone anion radicals by the iron oxide layers, e !ectively protecting the organic compound from photodegradation. Combining such in situ real-time kinetic measurements of thin "lms in future space exposure experiments on the ISS with post #ight sample return and analysis will provide time-course studies complemented by in-depth chemical analysis. This will facilitate the characterization and modeling of the chemistry of organic species associated with mineral surfaces in astrobiological contexts.

/pdf/organics-exposure-in-orbit-oreocube-a-next-generation-space-3xkt4dlfb6.pdf

Organics Exposure in Orbit (OREOcube): A next-generation space exposure platform.

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Lunar and Planetary Science Conference

American Astronomical Society Meeting Abstracts

Preliminary studies for the ORganics Exposure in Orbit (OREOcube) Experiment on the International Space Station

Organics Exposure in Orbit (OREOcube): A next-generation space exposure platform.