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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                   2022 April 3   
      
                     CMB Dipole: Speeding Through the Universe   
                 Image Credit: DMR, COBE, NASA, Four-Year Sky Map   
      
      Explanation: Our Earth is not at rest. The Earth moves around the Sun.   
      The Sun orbits the center of the Milky Way Galaxy. The Milky Way Galaxy   
      orbits in the Local Group of Galaxies. The Local Group falls toward the   
      Virgo Cluster of Galaxies. But these speeds are less than the speed   
      that all of these objects together move relative to the cosmic   
      microwave background radiation (CMBR). In the featured all-sky map from   
      the COBE satellite in 1993, microwave light in the Earth's direction of   
      motion appears blueshifted and hence hotter, while microwave light on   
      the opposite side of the sky is redshifted and colder. The map   
      indicates that the Local Group moves at about 600 kilometers per second   
      relative to this primordial radiation. This high speed was initially   
      unexpected and its magnitude is still unexplained. Why are we moving so   
      fast? What is out there?   
      
                        Tomorrow's picture: auroral vortex   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC   
                                & Michigan Tech. U.   
      
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