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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: Mystery Rings Spied Around Elderly Galaxies
11 August 2010 3:55 pm
Meet the real Lords of the Rings. These images, released today, show four of more than 20 highly unusual galaxies spied recently by NASA's Galaxy Evolution Explorer spacecraft, with follow-up observations by the Hubble Space Telescope. The galaxies, averaging about 10 billion years in age, are so old that standard theory dictates they can no longer spawn many new stars. But the rings, visible only in ultraviolet light (blue), say otherwise. They're so big—each would easily encircle the Milky Way—and energetic that astronomers say they must be the byproducts of enormous bursts of starmaking. Thus far, the only plausible explanation is that the galaxies in question must have somehow siphoned off enough gas from the intergalactic medium to spark the renewed activity. But such a phenomenon has never been observed before, so the rings will require more detailed study.
See more ScienceShots.