(Left) Galaxy cluster MACS J1206 observed with the Subaru Telescope. (Right) Magnified image of the left by the Hubble Space Telescope. Credit: NASA/ESA, Umetsu et al. 2012, ApJ, 755, 56
Analysis of gravitational lensing data by an international research team reveals that the evolution of galaxy clusters is dictated by a surprisingly simple law, which clearly shows that they are still growing. Using observational data from the Hubble Space Telescope and the Subaru Telescope, the size and mass of galaxy clusters have precisely been measured. The newfound law will serve as a tool to clarify the evolutionary history of clusters and the universe.
Galaxy clusters are the largest celestial body in the Universe...
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