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6 March 2014 1:04 pm ,
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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...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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ScienceShot: Water Vapor Detected Around Solar System's Largest Asteroid
22 January 2014 1:00 pm
It's not much—just 6 kilograms per second—but there's water vapor coming off two regions of Ceres, the solar system's largest asteroid. As astronomers report online today in Nature, the Herschel Space Observatory has discerned a watery spectral line at the far-infrared wavelength of 538 microns. Ceres revolves around the sun between the orbits of Mars and Jupiter every 4.6 years. The asteroid's path is somewhat elliptical, so its distance from the sun varies. Sunlight warms Ceres most when the asteroid comes closest, which was around the time Herschel detected the water vapor (shown with exaggerated clarity in this artist's conception). This suggests the sun does to Ceres what it does to comets: converts water ice into gas. However, there's a small chance the water vapor arises instead from geysers resembling those on Saturn's moon Enceladus. We'll find out more in February 2015, when NASA's Dawn spacecraft goes into orbit and gives us our first close-up look at the first asteroid astronomers ever discovered, back in 1801.