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Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
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ScienceShot: Flash Floods Make Gems on Titan
11 May 2010 5:40 pm
Gem hounds take note: Titan may hold some of the biggest and most unusual polished stones in the solar system. Radar data from the Cassini spacecraft show vast fields of smooth, rounded ice rocks--some more than 2 meters in diameter and nearly as transparent as rhinestones--on Xanadu, an Australia-sized plain south of the equator on Saturn's largest moon. Researchers have known about the stones ever since the European Huygens probe photographed Titan's landscape in January 2005 (above, left). But they didn't realize how many of them there were or that they were of such high quality. In a study published in the June issue of Icarus, the team reports that the stones are similar to those found in streambeds on Earth (above, right), but instead of being formed by water, the Titan stones likely bounced along streambeds of liquid methane and ethane for billions of years, which polished them to a remarkable smoothness.
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