U.S. astrophysicists report computer simulations that seem to resolve long-standing questions about the origin and life history of spiral arms in disk galaxies. Powerful new computer suggest that spiral arms in disk galaxies arise as a result of the influence of giant molecular clouds (Thiago Ize / Chris Johnson / Scientific Computing and Imaging Institute) The origin and fate of the spiral arms in disk galaxies have been debated by astrophysicists...
