A NASA satellite has uncovered evidence that a sea of neutrinos, almost weightless elementary particles that zip around at nearly the speed of light, permeates the universe. The discovery is part of a treasure trove of findings gleaned from data collected by the Wilkinson Anisotropy Probe (WMAP). This includes clear evidence the first stars took more than a half billion years to create a cosmic fog and a far better understanding of the burst of expansion in the universe's fraction of a second. (source: princeton.edu)
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