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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: Largest Spiral Galaxy Is a Stretch
11 January 2013 1:00 pm
LONG BEACH, CALIFORNIA—Astronomers have identified the largest spiral galaxy known. Spanning well over half a million light-years, NGC 6872 (seen in white and pink in this image acquired with the European Very Large Telescope) is at least five times the size of our own Milky Way, astronomers reported here on Thursday at the 221st meeting of the American Astronomical Society. The galaxy's distorted shape is largely due to its interaction with a smaller companion, IC 4970, seen here just above the main galaxy's core. Both are about 210 million light-years away. New ultraviolet observations with NASA's Galaxy Evolution Explorer (the UV radiation is coded blue in this composite image) revealed a new, young galaxy at the tip of the northeastern arm (upper left), which is not visible in the optical image. This so-called tidal dwarf galaxy probably formed as a result of the encounter of the two larger systems. Studying interacting galaxies like these will shed light on the way new stars can be formed well outside a normal galactic environment, the researchers said.
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