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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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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.