Galaxies
Jul 27 2008, Tomas

The origin of magnetic fields in galaxies is still a mystery to astronomers. Popular theories suggest continual strengthening over billions of years.

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Images
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This photo, released by NASA-ESA on Tuesday, Sept. 30, 2008, shows part of NGC 253 one of brightest spiral galaxies in the night sky, easily visible with small telescopes, which is composed of thousands of young, blue stars. It is undergoing intense...