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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: Young Galaxies Made Stars From Scratch
13 October 2010 1:09 pm
Modern galaxies like our own Milky Way became giants by swallowing their smaller neighbors and absorbing their billions of stars. But how did the earliest galaxies grow when there weren't nearly as many stars to swallow? A new study, reported online today in Nature, suggests that they swallowed the ingredients for stars instead. A team studying three galaxies that formed over 11 billion years ago observed them all sucking up cold, primordial hydrogen and helium gas from intergalactic space and churning out new stars in their central, star-making regions. Once the gas disappears, the galaxies either acquire new stars via mergers or in the aftermath of supernova explosions, which seed the heavens with heavier elements.
See more ScienceShots.