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ing the distribution of those galaxies, the way they clump and spread out, scientists
 

Summary: ing the distribution of those galaxies, the
way they clump and spread out, scientists
can figure out the forces that cause that
clumping and spreading--be they the gravi-
tational attraction of dark matter or the anti-
gravity push of dark energy. In October, the
SDSS team revealed its analysis of the first
quarter-million galaxies it had collected. It
came to the same conclusion that the
WMAP researchers had reached: The uni-
verse is dominated by dark energy.
This year scientists got their most direct
view of dark energy in action. In July, physi-
cists superimposed the galaxy-clustering
data of SDSS on the microwave data of
WMAP and proved--beyond a reasonable
doubt--that dark energy must exist. The
proof relies on a phenomenon known as the
integrated Sachs-Wolfe effect. The remnant
microwave radiation acted as a backlight,

  

Source: Asbury, Chip - Department of Physiology and Biophysics, University of Washington at Seattle
van Oijen, Antoine - Zernike Institute for Advanced Materials, Rijksuniversiteit Groningen

 

Collections: Biology and Medicine; Materials Science