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6 March 2014 1:04 pm ,
Vol. 343 ,
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...
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...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
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ScienceShot: Moons as Big as Earth? Not Yet
11 January 2013 12:30 pm
Can a moon be as large as Earth? If so, it might support life. Our solar system's biggest moon—Jupiter's Ganymede—is only 41% of Earth's diameter, but other solar systems could sport larger satellites (artist's conception shown). Now, as astronomers report in work submitted to The Astrophysical Journal, they've used data from NASA's Kepler spacecraft to study seven planet-hosting stars, finding no moons at all. For four of the planets, the data are sufficiently good to rule out moons as small as Earth. The result suggests that Earth-sized moons are rare, but the sample is tiny—and so the search for supermoons will continue.
See more ScienceShots.