... ESO . ... Galaxy Clusters . ... Observations with ESOтАЩs Very Large Telescope in Chile have discovered a new class of тАЬdarkтАЭ globular star clusters around the giant galaxy Centaurus A. These mysterious objects look similar to normal clusters, but contain much more mass and may either harbour unexpected amounts of dark matter, or contain massive black holes тАФ neither of which was expected nor is understood. Globular star clusters are huge balls of thousands of stars that orbit most galaxies. ...