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24 April 2014 11:45 am ,
Vol. 344 ,
Major climate data sets have underestimated the rate of global warming in the last 15 years owing largely to poor data...
The tsetse fly is best known as the vector for the trypanosome parasites that cause sleeping sickness and a disease in...
The National Institutes of Health is revising its "two strikes" rule, which allowed researchers only one chance to...
By stabilizing the components of retromers, molecular complexes that act like recycling bins in cells, a recently...
Fossil fuels power modern society by generating heat, but much of that heat is wasted. Semiconductor devices called...
Researchers are gaining insights into what made Supertyphoon Haiyan so powerful and devastating through post-storm...
Millions around the world got a first-hand look at what it was like to be in Tacloban while it was pummeled by...
- 24 April 2014 11:45 am , Vol. 344 , #6182
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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.
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