Researchers at the Tokyo Institute of Technology, NASA’s Johnson Space Center, Lunar Planetary Institute, and Carnegie Institute of Washington report on geochemical studies that help towards settling the controversy that surrounds the origin, abundance, and history of water on Mars.
Figure caption Hydrogen isotopic compositions of Martian volatile reservoirs (left diagram): near-surface crustal water (green square) and primordial water in the mantle (red triangle). These hydrogen isotopic compositions were obtained from tiny (<20 ìm) melt inclusions (pointed by red arrows) hosted by olivines in martian basaltic meteorites, and expressed as permillage difference (äD) relative to the reference Earth’s ocean water; äD = [(D/H)sample/(D/H)reference-1] x 1000. Most terrestrial water has relatively limited äD values, which overlap with the martian primordial water and bulk-chondrites but are distinct from comets and the martian atmosphere and crustal water. The right figure is an electron microprobe image (called back-scattered electron or compositional image); brighter areas indicate denser (i.e., richer in heavy elements such as iron) than darker areas.
As on Earth hydrogen also exists in the form of its isotope heavy hydrogen or deuterium (D), which has a neutron as well as proton at the nucleus. The ratio H/D changes as a result of lighter hydrogen being lost more readily from the Martian atmosphere. Consequently D/H ratios can provide important information on the origin of water and rocks on Mars.
04.09.2015 | University of California - Santa Barbara
NASA's Aqua Satellite sees Typhoon Kilo headed west
04.09.2015 | NASA/Goddard Space Flight Center
In a survey of NASA's Hubble Space Telescope images of 2,753 young, blue star clusters in the neighboring Andromeda galaxy (M31), astronomers have found that M31 and our own galaxy have a similar percentage of newborn stars based on mass.
By nailing down what percentage of stars have a particular mass within a cluster, or the Initial Mass Function (IMF), scientists can better interpret the light...
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE have developed a highly compact and efficient inverter for use in uninterruptible power...
China's Loess Plateau was formed by wind alternately depositing dust or removing dust over the last 2.6 million years, according to a new report from University of Arizona geoscientists. The study is the first to explain how the steep-fronted plateau formed.
China's Loess Plateau was formed by wind alternately depositing dust or removing dust over the last 2.6 million years, according to a new report from...
The leaves of the lotus flower, and other natural surfaces that repel water and dirt, have been the model for many types of engineered liquid-repelling surfaces. As slippery as these surfaces are, however, tiny water droplets still stick to them. Now, Penn State researchers have developed nano/micro-textured, highly slippery surfaces able to outperform these naturally inspired coatings, particularly when the water is a vapor or tiny droplets.
Enhancing the mobility of liquid droplets on rough surfaces could improve condensation heat transfer for power-plant heat exchangers, create more efficient...
Longer, more severe, and hotter droughts and a myriad of other threats, including diseases and more extensive and severe wildfires, are threatening to transform some of the world's temperate forests, a new study published in Science has found. Without informed management, some forests could convert to shrublands or grasslands within the coming decades.
"While we have been trying to manage for resilience of 20th century conditions, we realize now that we must prepare for transformations and attempt to ease...
03.09.2015 | Event News
20.08.2015 | Event News
20.08.2015 | Event News
04.09.2015 | Power and Electrical Engineering
04.09.2015 | Machine Engineering
04.09.2015 | Materials Sciences