Tag Archives: Abell 520

Dark Matter Core Defies Explanation in NASA Hubble Image

WASHINGTON, March 2, 2012  — Astronomers using data from NASA’s Hubble Telescope have observed what appears to be a clump of dark matter left behind from a wreck between massive clusters of galaxies. The result could challenge current theories about dark matter that predict galaxies should be anchored to the invisible substance even during the shock of… Read More »