The tiny temperature fluctuations of the cosmic microwave background (shown here as color) trace primordial density fluctuations in the early universe that seeded the later growth of galaxies. These ... more 
The tiny temperature fluctuations of the cosmic microwave background (shown here as color) trace primordial density fluctuations in the early universe that seeded the later growth of galaxies. These fluctuations produce a pattern of polarizatio less 
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SPACE.com | Photo By BICEP2 Collaboration
Tue, Mar 25, 2014 8:15 AM EDT