In a pre-print released today, astronomers have released measurements of the velocities of galaxies based upon data from the Sloan Digital Sky Survey (SDSS). These results bring into question the currently accepted values for the expansion of the universe, and the rate of the acceleration of the expansion. The authors consider reasons for the contradictions by theorizing a more and less dense galactic region. Learn more about the measurements and their implications online now here.
Yesterday, in the journal Nature, astrophysicists announced that data they utilized from the Sloan Digital Sky Survey (SDSS) has led them to the conclusion that Einstein’s General Theory of Relativity is valid. The astronomers used a “map of the distribution of galaxies in the Sloan Digital Sky Survey, going out to a distance of 7 billion light years.” The authors conclude that “the existence of dark matter is the most likely explanation for the observation that galaxies and galaxy clusters move as if under the influence of some unseen mass, in addition to the stars astronomers observe.” Read the announcement from UC Berkeley online here, or read the entire science paper online here.
In a non-mathematical review prepared for a conference, available online here, astronomer Jaan Einasto provides the general reader with a review of our understanding of the large scale structure of the universe. Dr. Einasto makes use of data and imagery from the Sloan Digital Sky Survey (SDSS) and includes simulations of the evolution of superclusters in the universe.