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10 April 2014 11:44 am ,
Vol. 344 ,
The Pyrenean ibex, an impressive mountain goat that lived in the central Pyrenees in Spain, went extinct in 2000. But a...
Tight budgets are forcing NASA to consider turning off one or more planetary science projects that have completed their...
Ebola is not a stranger to West Africa—an outbreak in the 1990s killed chimpanzees and sickened one researcher. But the...
In an as-yet-unpublished report, an international panel of geoscientists has concluded that a pair of deadly...
Tropical disease experts tried and failed before to eradicate yaws, a rare disfiguring disease of poor countries. Now,...
Since 2002, researchers have reported that agricultural communities in the hot and humid Pacific Coast of Central...
Balkan endemic kidney disease surfaced in the 1950s and for decades defied attempts to finger the cause. It occurred...
- 10 April 2014 11:44 am , Vol. 344 , #6180
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ScienceShot: Alien World Is More Earth-Like Than Any Found
30 October 2013 2:15 pm
Astronomers have discovered an alien world that’s more Earth-like in its size and composition than any ever found. It’s so close to its star, however, and consequently so infernally hot, that it’s more of a hellish cousin to Earth than a twin. The object (shown above, in an artist's impression), christened Kepler-78b, is one of hundreds of worlds beyond our solar system detected by NASA’s Kepler spacecraft, which has been monitoring the brightness of some 150,000 stars in the Milky Way in search of planets orbiting them. The majority of these so-called exoplanets are gas giants—big balls of gas and dust that are several times larger in radius than Earth. But Kepler-78b is only 80% more massive than Earth and 20% larger in radius, two groups of researchers report online today in Nature. That makes it about as dense as Earth and suggests that it is composed of rock and iron. But the object’s distance from its star (which is somewhat smaller than our sun) is only about twice the star’s radius, which means that the star would loom on the horizon like a gigantic disk, filling up a large part of the sky. Not a bad view, if you didn’t mind being burned to a crisp.