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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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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.