Template:POTD/2008-11-05
The anisotropies in the cosmic microwave background (CMB) as seen by NASA's Wilkinson Microwave Anisotropy Probe after five years of observations, projected from the full sky using the Mollweide projection. The CMB consists of electromagnetic radiation in the microwave region which pervades the universe. Most cosmologists consider this radiation to be the best known evidence for the Big Bang.Image credit: NASA / the WMAP Science Team