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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: A Mysterious Galactic Halo
23 April 2010 3:38 pm
There's nothing wrong with your computer screen. This view of the spiral galaxy M81 is deliberately off-center. That's because the image, taken with the 8.2-meter Subaru Telescope in Hawaii, is focused on the strange structure surrounding the galaxy. Astronomers say it's like nothing ever observed before. It doesn't resemble the halo surrounding our own Milky Way galaxy or the one around our nearest neighbor, Andromeda. Those halos are made of the stars from smaller galaxies that were consumed by their much-larger neighbors. But M81, located about 11.7 million light-years away in the constellation Ursa Major (also known as the Big Dipper) is showing something quite different: The stars sit amid gigantic wispy clouds, which Subaru's instruments indicate contain elements heavier than star-forming hydrogen and helium. Whether M81's halo comprises the remnants of very strange galaxies, or something other than galaxies, remains to be discovered.