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6 March 2014 1:04 pm ,
Vol. 343 ,
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...
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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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.