feb 162013
 
Alternative Gravity Theory Predicts Properties of Dwarf Galaxies

  Using modified laws of gravity, researchers from Case Western Reserve University and Weizmann Institute of Science closely predicted a key property measured in faint dwarf galaxies that are satellites of the nearby giant spiral galaxy Andromeda. The Andromeda Galaxy, our large neighbour galaxy. Image Credit & Copyright: Dieter Beer (http://www.starhopper.at) & Patrick Hochleitner (http://www.photonhunter.at) The [continue reading]

feb 012013
 
The Lack of Dwarf Galaxies Explained

  Astronomers of the international CLUES collaboration have identified “Cosmic Web Stripping” as a new way of explaining the famous missing dwarf problem: the lack of observed dwarf galaxies compared with that predicted by the theory of Cold Dark Matter and Dark Energy. Cosmic Web Stripping, Visualization. Image Credit: Alejandro Benitez Llambay High-precision observations over [continue reading]

jan 242013
 
New Revolutionary Theory of Dark Matter

  The Universe abounds with dark matter. Nobody knows what it consists of. Physicists from the University of Oslo have now launched a very hard mathematical explanation that could solve the mystery once and for all. SIGNS OF DARK MATTER: The image shows all the gamma rays recorded by the Fermi-LAT space probe as a map [continue reading]

jan 202013
 
No Galaxy Is An Island, Entire of Itself

  KIPAC scientists use X-ray observations show how galaxies shape their environment, and vice-versa   A major component of our understanding of galaxy evolution that has remained elusive is the influence of the local environment on the galaxy, especially when discussing galaxies in large clusters. Galaxy clusters, the largest gravitationally bound objects in the Universe, [continue reading]

jan 132013
 
Anne's Picture of the Day: The Train Wreck Cluster

January 13, 2013 The Train Wreck Cluster, a galaxy cluster in Orion Image Credit: NASA, ESA, CFHT, and M.J. Jee (University of California, Davis) The Train Wreck Cluster (Abell 520) is a galaxy cluster of 5.4 million light-years across that contains about 300 galaxies. It lies some 2.65 billion light-years away in the constellation of [continue reading]

dec 012012
 
‘Dark Core’ in Galaxy Cluster May Not Be So Dark After All

  Astronomers were puzzled earlier this year when NASA’s Hubble Space Telescope spotted an overabundance of dark matter in the heart of the merging galaxy cluster Abell 520. This observation was surprising because dark matter and galaxies should be anchored together, even during a collision between galaxy clusters. These composite images taken by two different [continue reading]