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6 March 2014 1:04 pm ,
Vol. 343 ,
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...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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ScienceShot: Light From Beyond the Universe's Dark Side
11 January 2013 12:15 pm
Most galaxies belong to large structures called superclusters (bright filaments seen in this simulation), which are separated by enormous voids (dark areas above) that harbor few galaxies at all. A galaxy's gravity can magnify the light of objects beyond it, so logically voids should do the opposite, dimming galaxies behind them. Now, however, new calculations in Physical Review Letters demonstrate "the bright side of voids": Because voids lack the gravitational pull of matter to restrain the universe's expansion, they expand faster than the overall cosmos, producing a Doppler shift that overwhelms the dimming and causes objects on a void's far side to look a few percent brighter than they otherwise would. Voids occupy more than half of the universe's volume, the researchers note, and should make some supernova explosions seem more powerful than they actually are. In fact, astronomers may have already unknowingly detected this effect, because they've observed that the peak brightness of what should be uniformly luminous supernovae varies more from explosion to explosion in isolated galaxies, which are more likely to lie on the edge of a void, than in galaxies residing in clusters.
See more ScienceShots.