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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: For Life's Evolution, Stellar Chemistry Matters
26 July 2012 5:14 pm
Planetary scientists agree that a planet's distance from its parent star is of paramount importance for creating conditions where liquid water might spur life. But what about the host star's chemical makeup? A paper in press at The Astrophysical Journal Letters argues that a greater abundance of carbon, sodium, magnesium, and silicon should be a plus for an inner solar system's long-term habitability. That's because the abundance of these elements make the star cooler and cause it to evolve more slowly, thereby giving planets in its habitable zone more time to develop life as we know it. The stellar abundance of oxygen, in particular, seems crucial in determining how long newly formed planets stay in the habitable zone around their host star, the researchers report. If our own sun had a lower abundance of oxygen, for example, Earth would have left the habitable zone a billion years ago, well before complex organisms evolved.
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