Digs over the years at the La Brea Tar Pits in the heart of Los Angeles have unearthed bones of mammoths, mastodons, saber-toothed cats and dire wolves that became trapped in ponds of sticky asphalt. But it's the smaller discoveries, like plants, insects and rodents, that in recent years are shaping scientists' views of life in the region 11,000 to 50,000 years ago.
Gas and oil deposits in shale have no place to hide from an Oak Ridge National Laboratory technique that provides an inside look at pores and reveals structural information potentially vital to the nation’s energy needs. The research could clear the path to the more efficient extraction of gas and oil from shale.
Earth’s most eminent emissary to Mars has just proven that those rare Martian visitors that sometimes drop in on Earth really are from the Red Planet. A key new measurement of Mars’ atmosphere by NASA’s Curiosity rover provides the most definitive evidence yet of the origins of Mars meteorites while at the same time providing a way to rule out Martian origins of other meteorites.
The same process that allows water to trickle through coffee grinds to create your morning espresso may have played a key role in the formation of the early Earth and influenced its internal organization, according to a new study by scientists at Stanford Univ.'s School of Earth Sciences.
Kerogen is a mixture of organic chemical compounds in sedimentary rocks that is a key intermediate of oil and natural gas. After five years of research, researchers in China have developed a terahertz time-domain spectroscopy method that effectively detects the generation of oil and gas from kerogen without contact or destruction of the sample material.
An important discovery has been made concerning the possible inventory of molecules available to early Earth. Scientists at Arizona State Univ. have found that the Sutter’s Mill meteorite, which exploded in a blazing fireball over California last year, contains organic molecules not previously found in any meteorites. These findings suggest a far greater availability of extraterrestrial organic molecules than previously thought possible.
A Univ. of Houston professor led a team of scientists to uncover the largest single volcano yet documented on Earth. Covering an area roughly equivalent to the British Isles or the state of New Mexico, this volcano, dubbed the Tamu Massif, is nearly as big as the giant volcanoes of Mars, placing it among the largest in the Solar System.
In May 2009, the Mars rover Spirit cracked through a crusty layer of Martian topsoil, sinking into softer underlying sand. The unexpected sand trap permanently mired the vehicle. The mission mishap may have been prevented by a better understanding of terramechanics, which describes the interaction between vehicles and deformable terrain.
Using detailed topographic information obtained from the U.S. Space Shuttle, a joint Australian-German research team has created the highest-resolution maps of Earth’s gravity field to date. The maps feature more than 3 billion points and show gravitational variations up to 40% larger than previously assumed.
Steven Benner of Westheimer Institute for Science and Technology will tell geochemists gathering Thursday at the annual Goldschmidt conference that an oxidized mineral form of the element molybdenum, which may have been crucial to the origin of life, could only have been available on the surface of Mars and not on Earth.
In the midst of an intensifying global water crisis, scientists are reporting development of a more economical way to use one form of the “ice that burns” to turn very salty wastewater from fracking and other oil and gas production methods into water for drinking and irrigation. The method removes more than 90% of the salt.
An analysis of gravity and topography data from Saturn's largest moon, Titan, has revealed unexpected features of the moon's outer ice shell. The best explanation for the findings, say scientists, is that Titan's ice shell is rigid and that relatively small topographic features on the surface are associated with large roots extending into the underlying ocean.
During the Cold War, U.S. and international monitoring agencies could spot nuclear tests and focused on measuring their sizes. Today, they’re looking around the globe to pinpoint much smaller explosives tests. Sandia National Laboratories and Los Alamos National Laboratory have partnered to develop a 3-D model of the Earth’s mantle and crust called SALSA3D, with the purpose to assist in locating explosions.
Using indicator molecules, a team of researchers working in Eurasia has for the first time assessed contributions of old carbon from permafrost soils to riverine carbon headed. They were also able to demonstrate that permafrost soils where the frozen areas are interspersed with gaps release more old carbon than those where the permafrost is uninterrupted.
Reservoirs of silica-rich magma can persist in Earth’s upper crust for hundreds of thousands of years without triggering an eruption, according to new modeling research. That means an area known to have experienced a massive volcanic eruption in the past, such as Yellowstone National Park, could have a large pool of magma festering beneath it and still not be close to going off as it did 600,000 years ago.
With a series of quick blasts and a cloud of dust a 13-story building on the Cal State-East Bay campus crashed to the ground Saturday morning as scientists monitored the impact on the nearby Hayward Fault. U.S. Geological Survey scientists had placed more than 600 seismographs in concentric circles within a mile of the building to pick up the vibrations and verify whether their predictions were correct.
Analysis of ice samples taken by the West Antarctic Ice Sheet (WAIS) Divide drilling project reveals that warming in Antarctica began about 22,000 years ago, a few thousand years earlier than suggested by previous records. This timing shows that West Antarctica did not "wait for a cue" from the Northern Hemisphere to start warming, as scientists had previously supposed.
Researchers at the Carnegie Institution and the Univ. of Illinois have for the first time been able to experimentally simulate the pressure conditions in the Earth’s mantle to measure thermal conductivity. A new technique using the mantle material magnesium oxide allowed the team to discover that heat transfer is actually lower than what has been claimed by other predictions and amounts to about 60% used by civilization today.
High pressures and temperatures cause materials to exhibit unusual properties, some of which can be special. Understanding such new properties is important for developing new materials for desired industrial uses and also for understanding the interior of Earth, where everything is hot and squeezed.
Brown Univ. planetary geologists have an explanation for the formation of more than 600 “double-layer ejecta” (DLE) craters on Mars. The Martian surface was covered with a thick sheet of ice at impact. Ejected material would later slide down steep crater sides and across the ice, forming a second layer.
Climate change alters the way in which species interact with one another—a reality that applies not just to today or to the future, but also to the past, according to a recent study which analyzed information about past episodes of rapid climate change from Earth's history. The researchers hope to use this finding to help predict future changes to our planet's ecosystems.
Sugars are important sources of energy for all organisms. Virginia Tech researchers have discovered that certain types of sugars, known as polysaccharides, may also control the timing and placement of minerals that animals use to produce hard structures such as shells and exoskeletons of mollusks, lobsters, and shrimp.
It's well known that the dinosaurs were wiped out 66 million years ago when a meteor hit what is now southern Mexico; but evidence is accumulating that the biggest extinction of all, 252.3 million years ago, at the end of the Permian period, was also triggered by an impact that changed the climate.
Researchers have demonstrated the reliability and efficiency of "real-time hybrid simulation" for testing a type of powerful damping system that might be installed in buildings and bridges to reduce structural damage and injuries during earthquakes. The magnetorheological-fluid dampers are shock-absorbing devices containing a liquid that becomes far more viscous when a magnetic field is applied.
The George E. Brown Jr. Network for Earthquake Engineering Simulation (NEES), based at Purdue Univ., includes 14 laboratories for earthquake engineering and tsunami research, tied together to provide information technology for the network. A new study has found that online tools, access to experimental data and other services provided through this "cyberinfrastructure" are helping to accelerate progress in earthquake science.