Last year when a team of astronomers led by a Michigan State University professor discovered two black holes in a collection of stars known as a globular cluster, they weren't sure if their presence was a common occurrence or a unique stroke of luck.
Fuente : http://www.eurekalert.org/pub_releases/2013-11/msu...
Fuente : http://www.eurekalert.org/pub_releases/2013-11/msu...