A survey of ice in Greenland has uncovered evidence suggesting a kilometer-wide iron asteroid slammed into that island, perhaps as recently as 12,000 years ago during the end of the Pleistocene. The resulting 19-mile-wide impact crater has remained hidden under a half-mile-thick ice sheet until now. It recently was exposed by an ultra-wideband chirp radar ...
A deeper understanding of the wiring and rewiring of the adolescent brain is helping scientists pinpoint why young people are especially vulnerable to mental health disorders in adolescence — and why some are resilient. When Charly Cox was diagnosed in her teenage years with depression and other mental health disorders, what lay ahead for her ...
Hundreds of hikers each day pass by the fallen boulder along the Bright Angel Trail in Grand Canyon National Park. It might otherwise go unnoticed except for the 28 indentations — sloping tiny footprints left behind by a small, reptile-like creature about 310 million years ago — that cover the rock’s expansive surface. Steve Rowland, ...
The presence of water on early Mars has been theorized for centuries. Early telescopes revealed ice caps, and early astronomers noted channels that were hypothesized to be natural rivers or creature-created canals. Over the past two decades, rovers Sojourner, Spirit, Opportunity, and Curiosity have sent back invaluable data to scientists who are trying to interpret ...
Some 10 billion years ago, the Milky Way merged with a large galaxy. The stars from this partner, named Gaia-Enceladus, make up most of the Milky Way’s halo and also shaped its thick disk, giving it its inflated form. A description of this mega-merger, discovered by an international team led by University of Groningen astronomer ...
Elevated concentrations of strontium, an element associated with oil and gas fracking wastewater, have accumulated in the shells of freshwater mussels downstream from fracking wastewater disposal sites, according to researchers from Penn State and Union College. Nathaniel Warner, assistant professor of environmental engineering at Penn State, said: “Freshwater mussels filter water and when they grow ...
A new study by researchers at The Australian National University (ANU) could help us understand how our planet was formed. Associate Professor Hrvoje Tkalčić and Ph.D. Scholar Thanh-Son Phạm are confident they now have direct proof the Earth’s inner core is solid. They came up with a way to detect shear waves, or “J waves,” ...
Flash drought across China is a rapidly intensifying the water deficit process accompanied by high temperatures over a short period of time. Recently, heat extremes have become more frequent in a warming climate, and have substantially increased the occurrence of two types of flash drought, which threatens crop yields and water supply. Dr. Linying Wang ...
If you’re standing in the Southern Hemisphere on a clear night, you can see two luminous clouds offset from the Milky Way. These clouds of stars are satellite galaxies of the Milky Way, called the Small Magellanic Cloud and the Large Magellanic Cloud, or SMC and LMC. Using newly released data from a new, powerful ...
If everyone on the planet wanted to eat a healthy diet, there wouldn’t be enough fruit and vegetables to feed the planet, according to a new University of Guelph study. A team of researchers compared global agricultural production with nutritionists’ consumption recommendations and found a drastic mismatch. Study co-author Prof. Evan Fraser, holder of the ...
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