Powerful new computer simulations like this one are allowing astronomers to understand how spiral arms in galaxies form and survive. These simulations suggest that the arms arise as a result of the ... more 
Powerful new computer simulations like this one are allowing astronomers to understand how spiral arms in galaxies form and survive. These simulations suggest that the arms arise as a result of the influence of giant molecular clouds - star for less 
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SPACE.com | Photo By Thiago Ize & Chris Johnson (Scientific Computing and Imaging Institute
Thu, Apr 4, 2013 12:00 PM EDT