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6 March 2014 1:04 pm ,
Vol. 343 ,
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...
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...
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ScienceShot: The Secret Lives of Wide Stellar Binaries
5 December 2012 1:00 pm
In a wide binary, two stars orbit each other even though they're much farther apart than Pluto is from our sun, and the nearest example is easy to find: Alpha Centauri, the sun's closest stellar neighbor, consists of a bright star and a faint one separated by one-fifth of a light-year. The bright "star" is a binary itself (artist's conception shown), so Alpha Centauri actually has three separate suns. Now, computer simulations reported online today in Nature imply that wide binaries often begin life as compact triple stars, two of which join up to kick the third away. If the cast-off star remains gravitationally bound to the other two—as with Alpha Centauri—a wide binary results with the far-off star orbiting the central pair on a highly elliptical path. The key to stability is simple: The far-off star must keep its distance. Perhaps our own star was born with two others but didn't heed this advice: As the other two stars cozied up together, the sun tried to intrude, and the happy couple gave it the boot.
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