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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...
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...
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Martian Tire Tracks Explained
22 February 2000 7:00 pm
WASHINGTON, D.C.--Researchers have discovered what causes the dark, mostly straight streaks that adorn the plains of Mars. "We caught a dust devil in action," whipped up by the fierce martian winds, said geologist Ken Edgett of Malin Space Science Systems in San Diego. He unveiled the image here Friday at the annual meeting of the American Association for the Advancement of Science, which publishes ScienceNOW.
So far, there were few hints as to the origin of the Martian stripes. Edgett dubbed them "SUV tracks," because they resemble the scars left by earthly sports utility vehicles. Now, after studying pictures recently beamed from NASA's Mars Global Surveyor spacecraft, he believes a blurry circle at the leading edge of one streak is one of the well-known martian dust devils in action. The minitornadoes kick up dust on the plains, he explains, exposing a darker material underneath that is visible as a streak. The picture even shows wisps, apparently of dust, "being sucked into the column," he says. "It's pretty neat."