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27 November 2013 12:59 pm ,
Vol. 342 ,
The new head of the National Center for Science Education promises to "fight the good fight" against attacks on...
Analyses of the H7N9 strains isolated from four new cases show that the virus is evolving rapidly, heightening anxiety...
In 2009, Jack Szostak shared a Nobel Prize for his part in discovering the role of telomeres, the end bits of...
Science has exposed a thriving academic black market in China involving shady agencies, corrupt scientists, and...
Paper-selling agencies flourish in the aura of reputable businesses. For some scientists, it may be difficult to tell...
Featuring the first lunar rover in 40 years, Chang'e-3 is seen as an important milestone on China's quest to send a...
Data collected by satellites and floating probes have chronicled a 2-decade rise in the temperature and thickness of a...
Cholesterol, the artery-clogging molecule that contributes to cardiovascular disease, has another nasty trick up its...
- 27 November 2013 12:59 pm , Vol. 342 , #6162
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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.