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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: 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.