okt 172012
Massive Galaxies See Big Meals and Snacks in Other Galaxies

  Gravity Lenses Suggest Big Collisions Make Galaxies Denser   Using gravitational “lenses” in space, University of Utah astronomers discovered that the centers of the biggest galaxies are growing denser – evidence of repeated collisions and mergers by massive galaxies with 100 billion stars. This image, taken by the Hubble Space Telescope, shows a ring [continue reading]