When galaxies eat galaxies: Gravitational lenses suggest big collisions make galaxies denser
Friday, October 12, 2012 - 04:00
in Astronomy & Space
(Phys.org)—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.