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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: Nearby Solar System Looks More Like Home
6 December 2012 12:50 pm
Gliese 581 (main image) is a red dwarf star just 21 light-years from Earth that boasts a number of planets. As astronomers report this month in Astronomy & Astrophysics, the Herschel Space Observatory has now discovered another feature that earthlings would find familiar: a ring of dust far from the star which resembles the Edgeworth-Kuiper belt, a zone of objects, each much smaller than Earth, that lies beyond Neptune's orbit and includes Pluto. The dim red star's light heats dust in the belt, which emits the far-infrared wavelengths that Herschel detects (inset). The newfound debris disk is about as large as the Edgeworth-Kuiper belt, even though Gliese 581 is small and all of its known planets lie closer to their sun than Earth does to ours. The scientists speculate that the little red star harbors a more remote planet whose gravity stirs up the belt's small objects, causing them to collide and spew the dust that Herschel has discerned.
See more ScienceShots.