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6 March 2014 1:04 pm ,
Vol. 343 ,
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...
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...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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ScienceShot: Comet Hartley 2 Spewing 'Cosmic Snowstorm'
18 November 2010 2:36 pm
Once scientists had a chance to deblur the images they took 2 weeks ago as NASA's EPOXI spacecraft sped by comet Hartley 2, they had a cosmic snowstorm on their hands. Pictures released today reveal giant fluffy flakes of water ice the size of golf balls and even basketballs. The source: Jets of carbon dioxide from warming dry ice are blasting ice particles and dust from either end of the comet nucleus (the brightness streaming from right to left in the image). At the same time, water vapor is gushing from a subsurface store of ice in the nucleus's midsection. The abundant carbon dioxide hints that Hartley 2 formed especially far from the sun in the nascent solar system, but team members haven't a clue what created the comet's dumbbell-like shape with dry ice at either end
See more ScienceShots.